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Fair Value Measurements (Changes in Level 3 Instruments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
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 $ 14 $ 14 $ 10 $ 10
Level 3 | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 4,042   4,175  
Net realized/unrealized gains (losses) included in earnings (8)   (21)  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 63   86  
Purchases 60   95  
Sales (5)   (106)  
Settlements (8)   (46)  
Transfers into Level 3 (11)   0  
Transfers out of Level 3 (275)   0  
Changes in Level 3, ending balance 3,859 4,042 4,183 4,175
Net change in unrealized gains (losses) relating to instruments still held 4   (32)  
Level 3 | Recurring | Derivatives        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 88   29  
Net realized/unrealized gains (losses) included in earnings 4   6  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0   0  
Purchases 0   1  
Sales 0   0  
Settlements 1   (2)  
Transfers into Level 3 (11)   0  
Transfers out of Level 3 (1)   0  
Changes in Level 3, ending balance 82 88 33 29
Net change in unrealized gains (losses) relating to instruments still held 4   6  
Level 3 | Recurring | Other        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 259   277  
Net realized/unrealized gains (losses) included in earnings 0   (38)  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0   0  
Purchases 0   0  
Sales 0   (14)  
Settlements 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 (259)   0  
Changes in Level 3, ending balance 0 259   277
Net change in unrealized gains (losses) relating to instruments still held 0   (38)  
Level 3 | US Corporate | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 3,006   3,053  
Net realized/unrealized gains (losses) included in earnings 4   4  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 100   59  
Purchases 60   94  
Sales (5)   (11)  
Settlements (8)   (36)  
Transfers into Level 3 0   0  
Transfers out of Level 3 (15)   0  
Changes in Level 3, ending balance 3,143 3,006 3,163 3,053
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 30   58  
Net realized/unrealized gains (losses) included in earnings 0   0  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 1   1  
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 31 30 58 58
Net change in unrealized gains (losses) relating to instruments still held 0   0  
Level 3 | Mortgage and asset-backed | Recurring        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Changes in Level 3, beginning balance 32   145  
Net realized/unrealized gains (losses) included in earnings (9)   5  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 0   (1)  
Purchases 0   0  
Sales 0   32  
Settlements 0   3  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Changes in Level 3, ending balance 23 32   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 290   337  
Net realized/unrealized gains (losses) included in earnings 0   0  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income 4   3  
Purchases 0   0  
Sales 0   (49)  
Settlements 0   0  
Transfers into Level 3 0   0  
Transfers out of Level 3 0   0  
Changes in Level 3, ending balance 295 290 290 337
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 0   2  
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   0  
Changes in Level 3, ending balance 0 0 2 2
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 323   266  
Net realized/unrealized gains (losses) included in earnings 0   0  
Net realized/unrealized gains (losses) included in accumulated other comprehensive income (45)   26  
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 277 $ 323 291 $ 266
Net change in unrealized gains (losses) relating to instruments still held $ 0   $ 0