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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity [Abstract]        
Tax (benefit) expense included in net unrealized gains (losses) $ 135 $ (117) $ 308 $ (128)
Tax included in reclassification (13) (13) (24) (22)
Tax included in amortization (4) (4) 7 7
Tax (benefit) expense included in net unrealized gains (losses) (10) 19 (38) 7
Tax included in reclassification 2 1 3 2
Tax (benefit) included in change in unfunded pension postretirement liability (less than $1 million) $ 0 $ 0 $ 0 $ 0