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Equity Activity in OCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Equity [Abstract]    
Net income $ 2,773 $ 1,136
Other comprehensive (loss) income, net of tax effect:    
Changes in net unrealized gains (losses) on AFS securities (net of tax of $5 and $48, respectively) 9 (89)
Reclassification adjustment for OTTI recognized in net income (net of tax of $0 and $10, respectively) 1 19
Reclassification adjustment for gains on AFS securities included in net income (net of tax of $1 and $69, respectively) (2) (128)
Other (2) (2)
Total other comprehensive income (loss) 6 (200)
Total comprehensive income 2,779 936
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]    
Changes in net unrealized gains (losses) on AFS securities (net of tax of $5 and $48, respectively) 5 (48)
Reclassification adjustment for OTTI recognized in net income (net of tax of $0 and $10, respectively) 0 10
Reclassification adjustment for gains on AFS securities included in net income (net of tax of $1 and $69, respectively) $ 1 $ 69