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Investments - Securities with a Decline in Fair Value (Details) - Fixed Maturities [Member]
$ in Millions
Mar. 31, 2018
USD ($)
Securities
Dec. 31, 2017
USD ($)
Securities
Investment Grade [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Fair value, one year or less $ 7,891 $ 3,272
Amortized cost, one year or less 8,062 3,309
Unrealized depreciation, one year or less $ (171) $ (37)
Number of issues, one year or less | Securities 1,596 797
Fair value, more than one year $ 1,467 $ 1,503
Amortized cost, more than one year 1,545 1,549
Unrealized depreciation, more than one year $ (78) $ (46)
Number of issues, more than one year | Securities 398 373
Below Investment Grade [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Fair value, one year or less $ 1,058 $ 543
Amortized cost, one year or less 1,080 553
Unrealized depreciation, one year or less $ (22) $ (10)
Number of issues, one year or less | Securities 1,096 643
Fair value, more than one year $ 148 $ 155
Amortized cost, more than one year 158 162
Unrealized depreciation, more than one year $ (10) $ (7)
Number of issues, more than one year | Securities 47 42