pre_text: the aes corporation notes to consolidated financial statements 2014 ( continued ) december 31 , 2012 , 2011 , and 2010 ( 1 ) a u.s . subsidiary of the company has a defined benefit obligation of $ 764 million and $ 679 million as of december 31 , 2012 and 2011 , respectively , and uses salary bands to determine future benefit costs rather than rates of compensation increases . rates of compensation increases in the table above do not include amounts related to this specific defined benefit plan . ( 2 ) includes an inflation factor that is used to calculate future periodic benefit cost , but is not used to calculate the benefit obligation . the company establishes its estimated long-term return on plan assets considering various factors , which include the targeted asset allocation percentages , historic returns and expected future returns . the measurement of pension obligations , costs and liabilities is dependent on a variety of assumptions . these assumptions include estimates of the present value of projected future pension payments to all plan participants , taking into consideration the likelihood of potential future events such as salary increases and demographic experience . these assumptions may have an effect on the amount and timing of future contributions . the assumptions used in developing the required estimates include the following key factors : 2022 discount rates ; 2022 salary growth ; 2022 retirement rates ; 2022 inflation ; 2022 expected return on plan assets ; and 2022 mortality rates . the effects of actual results differing from the company 2019s assumptions are accumulated and amortized over future periods and , therefore , generally affect the company 2019s recognized expense in such future periods . sensitivity of the company 2019s pension funded status to the indicated increase or decrease in the discount rate and long-term rate of return on plan assets assumptions is shown below . note that these sensitivities may be asymmetric and are specific to the base conditions at year-end 2012 . they also may not be additive , so the impact of changing multiple factors simultaneously cannot be calculated by combining the individual sensitivities shown . the funded status as of december 31 , 2012 is affected by the assumptions as of that date . pension expense for 2012 is affected by the december 31 , 2011 assumptions . the impact on pension expense from a one percentage point change in these assumptions is shown in the table below ( in millions ) : .
post_text: .
table: Increase of 1% in the discount rate $(48)
table: Decrease of 1% in the discount rate 38
table: Increase of 1% in the long-term rate of return on plan assets (47)
table: Decrease of 1% in the long-term rate of return on plan assets 47
question: Analyse this data from a financial earnings document. what was the net reduction in defined benefit obligations between december 31 , 2012 and 2011 , in millions?