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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - Level 3 - Recurring - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance $ 4,427 $ 4,042
Net realized/unrealized gains (losses) included in earnings 10 (8)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 5 63
Purchases 91 60
Sales 0 (5)
Settlements (90) (8)
Transfers into Level 3 12 (11)
Transfers out of Level 3 (471) (275)
Changes in Level 3, ending balance 3,985 3,859
Derivative Assets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 21 88
Net realized/unrealized gains (losses) included in earnings 1 4
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (1) 0
Purchases (1) 0
Sales 0 0
Settlements (2) 1
Transfers into Level 3 0 (11)
Transfers out of Level 3 (1) (1)
Changes in Level 3, ending balance 17 82
Investment Securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 4,406 3,695
Net realized/unrealized gains (losses) included in earnings 9 (12)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 6 64
Purchases 92 60
Sales 0 5
Settlements (88) (9)
Transfers into Level 3 11 0
Transfers out of Level 3 (470) (15)
Changes in Level 3, ending balance 3,967 3,777
Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 0 259
Net realized/unrealized gains (losses) included in earnings 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 (259)
Changes in Level 3, ending balance 0 $ 0
U.S. Corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases $ 91