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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Cash Accruals Not Included In Schedule Assets Measured For Fair Value On Recurring Basis $ 9 $ 4
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 2,653  
Changes in Level 3, ending balance 2,596 2,653
Level 3 | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 4,128 5,093
Net realized/unrealized gains (losses) included in earnings 183 (85)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 186 (149)
Purchases 759 469
Sales (535) (645)
Settlements (395) (628)
Transfers into Level 3 191 198
Transfers out of Level 3 (271) (125)
Changes in Level 3, ending balance 4,246 4,128
Net change in unrealized gains (losses) relating to instruments still held 91 (3)
Level 3 | Recurring | Derivatives    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 20 239
Net realized/unrealized gains (losses) included in earnings 13 (36)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 1
Purchases (1) 1
Sales 0 0
Settlements 3 (224)
Transfers into Level 3 2 37
Transfers out of Level 3 (1) 2
Changes in Level 3, ending balance 36 20
Net change in unrealized gains (losses) relating to instruments still held 18 9
Level 3 | Recurring | Retained interest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 1 0
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 1
Sales 0 0
Settlements (1) 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Changes in Level 3, ending balance 0 1
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Recurring | Other    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 201 367
Net realized/unrealized gains (losses) included in earnings 85 26
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0
Purchases 32 45
Sales (41) (237)
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Changes in Level 3, ending balance 277 201
Net change in unrealized gains (losses) relating to instruments still held 73 (12)
Level 3 | US Corporate | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 2,787 3,106
Net realized/unrealized gains (losses) included in earnings 18 13
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 131 (75)
Purchases 544 377
Sales (228) (402)
Settlements (212) (231)
Transfers into Level 3 175 108
Transfers out of Level 3 (159) (109)
Changes in Level 3, ending balance 3,056 2,787
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | State and municipal | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 96 77
Net realized/unrealized gains (losses) included in earnings 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 12 (7)
Purchases 12 22
Sales 0 0
Settlements (5) (6)
Transfers into Level 3 0 10
Transfers out of Level 3 0 0
Changes in Level 3, ending balance 115 96
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Residential Mortgage Backed Securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 86 100
Net realized/unrealized gains (losses) included in earnings 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 2 (5)
Purchases 0 0
Sales (16) (2)
Settlements (9) (7)
Transfers into Level 3 0 0
Transfers out of Level 3 (47) 0
Changes in Level 3, ending balance 16 86
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Commercial mortgage backed | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 10 6
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 (3) (6)
Transfers into Level 3 2 10
Transfers out of Level 3 0 0
Changes in Level 3, ending balance 9 10
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Asset-backed | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 145 145
Net realized/unrealized gains (losses) included in earnings 3 5
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 4 6
Purchases 0 0
Sales 0 (1)
Settlements (19) (22)
Transfers into Level 3 0 12
Transfers out of Level 3 (10) 0
Changes in Level 3, ending balance 123 145
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Corporate - non-U.S. | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 515 721
Net realized/unrealized gains (losses) included in earnings 64 (94)
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 3 (5)
Purchases 170 23
Sales (248) (3)
Settlements (149) (132)
Transfers into Level 3 1 21
Transfers out of Level 3 (19) (16)
Changes in Level 3, ending balance 337 515
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Government - non-U.S. | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 31 42
Net realized/unrealized gains (losses) included in earnings 0 1
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 (12)
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 2 0
Transfers out of Level 3 (31) 0
Changes in Level 3, ending balance 2 31
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | U.S. Government and federal agency | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 225 277
Net realized/unrealized gains (losses) included in earnings 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 34 (52)
Purchases 0 0
Sales 0 0
Settlements 0 0
Transfers into Level 3 9 0
Transfers out of Level 3 (2) 0
Changes in Level 3, ending balance 266 225
Net change in unrealized gains (losses) relating to instruments still held 0 0
Level 3 | Available-for-sale Securities | Recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Changes in Level 3, beginning balance 11 13
Net realized/unrealized gains (losses) included in earnings 0 0
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0 0
Purchases 2 0
Sales (2) 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 (2) (2)
Changes in Level 3, ending balance 9 11
Net change in unrealized gains (losses) relating to instruments still held $ 0 $ 0