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Fair Value (Assets and liabilities measured at fair value on a recurring basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis $ 43,536 $ 42,406
Fair value of liabilities, measured on a recurring basis 3 (3)
Corporate and other bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 19,374 19,527
States, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 14,027 13,240
Total asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 8,086 8,138
Fixed maturity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 41,487 40,905
Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 695 110
Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 1,354 1,333
Life settlement contracts, included in Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis   58
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 615 678
Fair value of liabilities, measured on a recurring basis 0 0
Level 1 | Corporate and other bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 128 112
Level 1 | States, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 0 0
Level 1 | Total asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 0 0
Level 1 | Fixed maturity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 128 112
Level 1 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 91 91
Level 1 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 396 475
Level 1 | Life settlement contracts, included in Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis   0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 42,467 41,321
Fair value of liabilities, measured on a recurring basis 3 (3)
Level 2 | Corporate and other bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 19,148 19,285
Level 2 | States, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 14,026 13,239
Level 2 | Total asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 7,751 7,939
Level 2 | Fixed maturity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 40,925 40,463
Level 2 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 584 0
Level 2 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 958 858
Level 2 | Life settlement contracts, included in Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis   0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 454 407
Fair value of liabilities, measured on a recurring basis 0 0
Level 3 | Corporate and other bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 98 130
Level 3 | States, municipalities and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 1 1
Level 3 | Total asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 335 199
Level 3 | Fixed maturity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 434 330
Level 3 | Equity securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis 20 19
Level 3 | Short term investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis $ 0 0
Level 3 | Life settlement contracts, included in Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of assets, measured on a recurring basis   $ 58