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Investments - Securities with a Decline in Fair Value (Details) - Fixed Maturities [Member]
$ in Millions
Jun. 30, 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 $ 9,283 $ 3,272
Amortized cost, one year or less 9,566 3,309
Unrealized depreciation, one year or less $ (283) $ (37)
Number of issues, one year or less | Securities 1,944 797
Fair value, more than one year $ 1,759 $ 1,503
Amortized cost, more than one year 1,852 1,549
Unrealized depreciation, more than one year $ (93) $ (46)
Number of issues, more than one year | Securities 470 373
Below Investment Grade [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Fair value, one year or less $ 1,285 $ 543
Amortized cost, one year or less 1,318 553
Unrealized depreciation, one year or less $ (33) $ (10)
Number of issues, one year or less | Securities 1,157 643
Fair value, more than one year $ 147 $ 155
Amortized cost, more than one year 158 162
Unrealized depreciation, more than one year $ (11) $ (7)
Number of issues, more than one year | Securities 55 42