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Accumulated Other Comprehensive Loss - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Equity [Abstract]    
Tax (benefit) expense included in net unrealized gains (losses) $ 173 $ (11)
Tax included in reclassification (11) (9)
Tax included in amortization 3 3
Tax (benefit) expense included in net unrealized gains (losses) (28) (12)
Tax included in reclassification 1 1
Tax (benefit) included in change in unfunded pension postretirement liability (less than $1 million) $ 0 $ 0