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Investments (Unrealized Losses and Fair Values) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values $ 546 $ 6,838
Less than 12 months, Unrealized losses (3) (226)
12 months or more, Fair values 2,833 4,360
12 months or more, Unrealized losses (19) (115)
U.S. Treasury notes [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 105 1,219
Less than 12 months, Unrealized losses 0 (21)
12 months or more, Fair values 724 1,444
12 months or more, Unrealized losses (2) (26)
Other government-related debt securities - U.S. [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 0 0
Less than 12 months, Unrealized losses 0 0
12 months or more, Fair values 48 110
12 months or more, Unrealized losses 0 (2)
Other government-related debt securities - Foreign and other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 6 631
Less than 12 months, Unrealized losses 0 (31)
12 months or more, Fair values 115 240
12 months or more, Unrealized losses (3) (10)
Corporate debt securities - Financial [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 121 1,968
Less than 12 months, Unrealized losses 0 (59)
12 months or more, Fair values 320 718
12 months or more, Unrealized losses (1) (22)
Corporate debt securities - Industrial [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 191 1,898
Less than 12 months, Unrealized losses (3) (81)
12 months or more, Fair values 500 529
12 months or more, Unrealized losses (3) (18)
Corporate debt securities - Other [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 30 529
Less than 12 months, Unrealized losses 0 (20)
12 months or more, Fair values 40 28
12 months or more, Unrealized losses 0 (1)
Residential mortgage-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 93 576
Less than 12 months, Unrealized losses 0 (14)
12 months or more, Fair values 685 840
12 months or more, Unrealized losses (4) (22)
Other mortgage- and asset-backed securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair values 0 17
Less than 12 months, Unrealized losses 0 0
12 months or more, Fair values 401 451
12 months or more, Unrealized losses $ (6) $ (14)