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(Temporarily Impaired Securities) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Securities, Less than 12 Months, Fair Value $ 1,011 $ 458
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 251 170
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,262 628
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months (75) (6)
Available-for-sale Securities, Continuous Unrealized Loss Position, More than 12 Months (11) (8)
Available-for-sale Securities, Continuous Unrealized Position (86) (14)
Cost method investments, aggregate cost 204  
Net unrealized gain recognized in equity securities 7  
Government debt    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Securities, Less than 12 Months, Fair Value 287 295
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 187 151
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 474 446
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months (17) (4)
Available-for-sale Securities, Continuous Unrealized Loss Position, More than 12 Months (6) (7)
Available-for-sale Securities, Continuous Unrealized Position (23) (11)
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Temporarily Impaired Securities, Less than 12 Months, Fair Value 724 163
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 64 19
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 788 182
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months (58) (2)
Available-for-sale Securities, Continuous Unrealized Loss Position, More than 12 Months (5) (1)
Available-for-sale Securities, Continuous Unrealized Position (63) (3)
Equity securities    
Debt Securities, Available-for-sale [Line Items]    
Equity securities $ 16 $ 140