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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Available-for-sale Debt Securities, Amortized Cost Basis $ 54,478 $ 53,805
Available-for-sale Equity Securities, Amortized Cost Basis 1,010 1,020
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020) $ 1,112 $ 1,097
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,500,000,000 1,500,000,000
Common stock, shares issued 402,923,222.00 402,923,222
Treasury stock, shares 45,382,811 28,974,069
Commercial Loan [Member]    
Allowance for Loan and Lease Losses, Real Estate $ 1 $ 19
Fixed Maturities [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 0
Equity Securities [Member]    
Equity securities, available-for-sale, at fair value (cost of $1,010 and $1,020) 0 0
Short-term Investments [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 0
Equity Securities [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 0
Cash [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 5
Other Assets [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets 0 0
Other Liabilities [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities 0 5
Partnership Interest [Member]    
Variable Interest Entity, Consolidated, Carrying Amount, Assets $ 0 $ 0