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Schedule VI Supplemental Information Concerning Property and Casualty Insurance Operations Level 4 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Liability and Casualty Insurance Product Line [Member]      
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]      
Short-duration Insurance Contracts, Discounted Liabilities, Aggregate Discount $ 483 $ 523 $ 556
Losses and Loss Adjustment Expenses Incurred Related to: Current Year 6,990 6,647 6,572
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) 457 250 228
Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid $ 6,968 $ 6,719 $ 6,711
Weighted Average Discount Rate, Percent   3.24% 3.50%
Accident and Health Insurance Product Line [Member]      
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]      
Weighted Average Discount Rate, Percent 3.11% 3.24% 3.50%
Accident and Health Insurance Product Line [Member] | Property, Liability and Casualty Insurance Product Line [Member]      
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]      
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) $ (119) $ (37) $ (7)