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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2015
Jun. 30, 2014
Equity [Abstract]        
Tax (benefit) expense included in net unrealized gains (losses) $ (117) $ 110 $ (128) $ 202
Tax included in reclassification (13) 3 (22) (6)
Tax included in amortization (4) 0 7 0
Tax included in reclassification due to accretion 0 1 0 3
Tax (benefit) expense included in net unrealized gains (losses) 19 (10) 7 (23)
Tax included in reclassification 1 1 2 1
Tax (benefit) included in change in unfunded pension postretirement liability (less than $1 million) $ 0 $ 0 $ 0 $ 0