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Reserves for Unpaid Losses and Loss Adjustment Expenses Level 4 Discounted Reserves, P&C (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Weighted Average Discount Rate [Line Items]      
Current accident year benefit from discounting property and casualty reserves $ 27 $ 35 $ 34
Property, Liability and Casualty Insurance Product Line [Member]      
Weighted Average Discount Rate [Line Items]      
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1,504,000,000 1,607,000,000 1,577,000,000
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount 483,000,000 523,000,000 556,000,000
Short-Duration Contracts, Discounted Liabilities, Amount 1,021,000,000 1,084,000,000 1,021,000,000
Accretion of Discounts for Prior Accident Years $ 29,000,000 $ 38,000,000 $ 31,000,000
Weighted Average Discount Rate, Percent   3.24% 3.50%
Accident and Health Insurance Product Line [Member]      
Weighted Average Discount Rate [Line Items]      
Weighted Average Discount Rate, Percent 3.11% 3.24% 3.50%
Minimum [Member] | Property, Liability and Casualty Insurance Product Line [Member]      
Weighted Average Discount Rate [Line Items]      
Range of Discount Rates 1.77% 1.77% 1.77%
Maximum [Member] | Property, Liability and Casualty Insurance Product Line [Member]      
Weighted Average Discount Rate [Line Items]      
Range of Discount Rates 14.15% 14.15% 14.15%