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Fair Value Measurements (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Cumulative Gain (Loss) Adjustment For Non Performance Risk $ (9)  
Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 40,608 $ 33,512
Liabilities 1,778 1,895
Recurring | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 646 713
Recurring | Other Liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 1,132 1,182
Recurring | Derivatives    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 888 1,281
Cumulative Gain (Loss) Adjustment For Non Performance Risk (9)  
Recurring | Other Assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets   259
US Corporate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 24,848 22,358
State and municipal | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 4,568 4,245
Mortgage and asset-backed | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 3,122 3,116
Corporate - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 5,412 847
Fair Value Of Securities Transferred Between Level 1 And Level 2 12  
Government - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 764 415
U.S. Government and federal agency | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 839 776
Fair Value Of Securities Transferred Between Level 1 And Level 2 50  
Equity | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 167 217
Level 1 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 143 260
Liabilities 0 0
Level 1 | Recurring | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 0 0
Level 1 | Recurring | Other Liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 0 0
Level 1 | Recurring | Derivatives    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Level 1 | Recurring | Other Assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets   0
Level 1 | US Corporate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Level 1 | State and municipal | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Level 1 | Mortgage and asset-backed | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Level 1 | Corporate - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 12
Level 1 | Government - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 5
Level 1 | U.S. Government and federal agency | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 49
Level 1 | Equity | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 143 194
Level 2 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 43,226 35,331
Liabilities 5,606 6,860
Level 2 | Recurring | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 4,474 5,677
Level 2 | Recurring | Other Liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 1,132 1,182
Level 2 | Recurring | Derivatives    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 7,669 7,312
Level 2 | Recurring | Other Assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets   0
Level 2 | US Corporate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 21,426 19,351
Level 2 | State and municipal | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 4,536 4,215
Level 2 | Mortgage and asset-backed | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 3,115 3,084
Level 2 | Corporate - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 5,168 544
Level 2 | Government - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 764 410
Level 2 | U.S. Government and federal agency | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 532 404
Level 2 | Equity | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 16 9
Level 3 | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 4,060 4,033
Liabilities 3 4
Level 3 | Recurring | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 3 4
Level 3 | Recurring | Other Liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 0 0
Level 3 | Recurring | Derivatives    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 40 79
Level 3 | Recurring | Other Assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets   259
Level 3 | US Corporate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 3,422 3,006
Level 3 | State and municipal | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 32 30
Level 3 | Mortgage and asset-backed | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 8 32
Level 3 | Corporate - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 244 290
Level 3 | Government - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Level 3 | U.S. Government and federal agency | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 307 323
Level 3 | Equity | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 8 13
Netting Adjustment | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets (6,821) (6,110)
Liabilities (3,830) (4,968)
Netting Adjustment | Recurring | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities (3,830) (4,968)
Netting Adjustment | Recurring | Other Liabilities    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Liabilities 0 0
Netting Adjustment | Recurring | Derivatives    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets (6,821) (6,110)
Netting Adjustment | Recurring | Other Assets    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets   0
Netting Adjustment | US Corporate | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | State and municipal | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | Mortgage and asset-backed | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | Corporate - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | Government - non-U.S. | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | U.S. Government and federal agency | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets 0 0
Netting Adjustment | Equity | Recurring    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Assets $ 0 $ 0