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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance     $ 2,594  
Changes in Level 3, ending balance $ 2,689   2,689  
Fair Value, Measurements, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,855 $ 4,130 3,948 $ 3,878
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 4 8 7 46
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 9 9 (65) 216
Purchases 75 103 254 453
Sales (28) (56) (171) (284)
Settlements (44) (124) (118) (215)
Transfers into Level 3 41 41 83 181
Transfers out of Level 3 (69) (48) (95) (212)
Changes in Level 3, ending balance 3,842 4,063 3,842 4,063
Net change in unrealized gains (losses) relating to instruments still held 0 2 0 12
Fair Value, Measurements, Recurring | Derivatives Assets And Liabilities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 71 22 28 19
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 1 3 0 7
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 1 3 1
Purchases 1 (1) 0 (1)
Sales 0 0 0 0
Settlements 0 (1) 0 (1)
Transfers into Level 3 0 0 42 (1)
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 72 24 72 24
Net change in unrealized gains (losses) relating to instruments still held 0 2 0 12
Cash Accruals Not Included In Schedule Assets Measured For Fair Value On Recurring Basis 12 9 12 9
Fair Value, Measurements, Recurring | Retained Interest [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance   1   1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) 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   (1)   (1)
Transfers into Level 3   0   0
Transfers out of Level 3   0   0
Changes in Level 3, ending balance   0   0
Net change in unrealized gains (losses) relating to instruments still held   0   0
Fair Value, Measurements, Recurring | Other Assets And Liabilities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance   0   0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) 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   0
Changes in Level 3, ending balance   0   0
Net change in unrealized gains (losses) relating to instruments still held 0 0   0
Fair Value, Measurements, Recurring | Domestic Corporate Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,019 3,032 3,044 2,751
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 5 4 16 22
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (7) (1) (93) 126
Purchases 74 102 248 440
Sales (28) (56) (83) (212)
Settlements (37) (90) (93) (158)
Transfers into Level 3 35 32 35 170
Transfers out of Level 3 (14) 0 (27) (116)
Changes in Level 3, ending balance 3,046 3,023 3,046 3,023
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | US States and Political Subdivisions Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 101 110 115 96
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1 2 (3) 9
Purchases 0 2 0 12
Sales 0 0 0 0
Settlements (5) (1) (15) (4)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (17) 0 (17) 0
Changes in Level 3, ending balance 81 113 81 113
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Residential Mortgage Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 2 66 16 86
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 5 1
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0 (4) 0
Purchases 0 0 0 0
Sales 0 0 (15) (16)
Settlements (1) (3) (1) (8)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (47) 0 (47)
Changes in Level 3, ending balance 2 16 2 16
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Commercial Mortgage Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 2 11 9 10
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 (7) 0
Settlements 0 (1) 0 (2)
Transfers into Level 3 0 0 0 2
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 1 10 1 10
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Asset-backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 76 130 123 145
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (2) 1 (16) 3
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 2 (5) 6
Purchases 0 0 0 0
Sales 0 0 (12) 0
Settlements 0 (4) (3) (15)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (36) 0 (49) (10)
Changes in Level 3, ending balance 38 129 38 129
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Foreign Corporate Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 283 499 336 503
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 13
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 (1) (4) 42
Purchases 0 0 0 0
Sales 0 0 (49) (54)
Settlements (1) (23) (1) (24)
Transfers into Level 3 0 0 0 1
Transfers out of Level 3 0 0 0 (6)
Changes in Level 3, ending balance 282 475 282 475
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Foreign Government Debt Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 2 1 2 31
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0 0 0
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (2) (1) (2) (31)
Changes in Level 3, ending balance 0 0 0 0
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | US Treasury and Government [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 293 249 266 225
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 16 6 44 32
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (1) 0
Transfers into Level 3 0 9 0 9
Transfers out of Level 3 0 0 0 (2)
Changes in Level 3, ending balance 309 264 309 264
Net change in unrealized gains (losses) relating to instruments still held 0 0 0 0
Fair Value, Measurements, Recurring | Available-for-sale Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 6 9 9 11
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 0 2 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (1) 0 (3) 0
Purchases 0 0 6 2
Sales 0 0 (5) (2)
Settlements 0 0 (4) (2)
Transfers into Level 3 6 0 6 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 10 9 10 9
Net change in unrealized gains (losses) relating to instruments still held $ 0 $ 0 $ 0 $ 0