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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - Fair Value, Inputs, Level 3 - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 2,664   2,664  
Fair Value, Measurements, Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,997 $ 4,088 3,948 $ 3,878
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (11) 31 3 38
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (162) 120 (74) 207
Purchases 86 190 179 350
Sales (43) (228) (143) (228)
Settlements (28) (35) (74) (91)
Transfers into Level 3 42 43 42 140
Transfers out of Level 3 (26) (79) (26) (164)
Changes in Level 3, ending balance 3,855 4,130 3,855 4,130
Net change in unrealized gains (losses) relating to instruments still held 0 4 0 10
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 30 18 28 19
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (1) 4 (1) 4
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1 0 3 0
Purchases (1) 0 (1) 0
Sales 0 0 0 0
Settlements 0 0 0 0
Transfers into Level 3 42 0 42 (1)
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 71 22 71 22
Net change in unrealized gains (losses) relating to instruments still held 0 4 0 10
Cash Accruals Not Included In Schedule Assets Measured For Fair Value On Recurring Basis 11 8 11 8
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   0   0
Transfers into Level 3   0   0
Transfers out of Level 3   0   0
Changes in Level 3, ending balance   1   1
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
Changes in Level 3, ending balance   0   0
Net change in unrealized gains (losses) relating to instruments still held 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 3,150 2,976 3,044 2,751
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 4 13 11 18
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (145) 60 (86) 127
Purchases 81 187 174 338
Sales (38) (156) (55) (156)
Settlements (20) (27) (56) (68)
Transfers into Level 3 0 42 0 138
Transfers out of Level 3 (13) (63) (13) (116)
Changes in Level 3, ending balance 3,019 3,032 3,019 3,032
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 114 105 115 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 (5) 4 (4) 7
Purchases 0 1 0 10
Sales 0 0 0 0
Settlements (8) 0 (10) (3)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 101 110 101 110
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 81 16 86
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 1 5 1
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 1 (4) 0
Purchases 0 0 0 0
Sales 0 (16) (15) (16)
Settlements 0 (1) 0 (5)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 2 66 2 66
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 0 0 (1)
Transfers into Level 3 0 0 0 2
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 2 11 2 11
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 111 142 123 145
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings (14) 1 (14) 2
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (8) 2 (5) 4
Purchases 0 0 0 0
Sales 0 0 (12) 0
Settlements 0 (5) (3) (11)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 (13) (10) (13) (10)
Changes in Level 3, ending balance 76 130 76 130
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 290 510 336 503
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 0 12 0 13
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (7) 36 (4) 43
Purchases 0 0 0 0
Sales 0 (54) (49) (54)
Settlements 0 0 0 (1)
Transfers into Level 3 0 1 0 1
Transfers out of Level 3 0 (6) 0 (6)
Changes in Level 3, ending balance 283 499 283 499
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 0 0 0 (30)
Changes in Level 3, ending balance 2 1 2 1
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 291 232 266 225
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 2 17 28 26
Purchases 0 0 0 0
Sales 0 0 0 0
Settlements 0 0 (1) 0
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 (2)
Changes in Level 3, ending balance 293 249 293 249
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 5 11 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 0 0 (2) 0
Purchases 6 2 6 2
Sales (5) (2) (5) (2)
Settlements 0 (2) (4) (2)
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 0 0 0
Changes in Level 3, ending balance 6 9 6 9
Net change in unrealized gains (losses) relating to instruments still held $ 0 $ 0 $ 0 $ 0