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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position Deemed not to be Other-than-Temporarily Impaired (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses $ (2) $ (1)
Less than 12 Months, Fair Value 3,817 2,804
12 Months or Greater, Unrealized Losses (1) (52)
12 Months or Greater, Fair Value 594 7,518
Gross Unrealized Losses (3) (53)
Total Estimated Fair Value 4,411 10,322
U.S. treasury securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses (1) 0
Less than 12 Months, Fair Value 1,339 896
12 Months or Greater, Unrealized Losses 0 (9)
12 Months or Greater, Fair Value 96 1,383
Gross Unrealized Losses (1) (9)
Total Estimated Fair Value 1,435 2,279
U.S. government agencies securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses 0 0
Less than 12 Months, Fair Value 902 30
12 Months or Greater, Unrealized Losses 0 (5)
12 Months or Greater, Fair Value 30 553
Gross Unrealized Losses 0 (5)
Total Estimated Fair Value 932 583
Non-U.S. government securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses 0 0
Less than 12 Months, Fair Value 25 86
12 Months or Greater, Unrealized Losses 0 (2)
12 Months or Greater, Fair Value 0 192
Gross Unrealized Losses 0 (2)
Total Estimated Fair Value 25 278
Corporate debt securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses (1) (1)
Less than 12 Months, Fair Value 1,541 1,600
12 Months or Greater, Unrealized Losses 0 (28)
12 Months or Greater, Fair Value 297 4,204
Gross Unrealized Losses (1) (29)
Total Estimated Fair Value 1,838 5,804
Residential mortgage and asset-backed securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses 0 0
Less than 12 Months, Fair Value 10 192
12 Months or Greater, Unrealized Losses (1) (8)
12 Months or Greater, Fair Value 171 1,186
Gross Unrealized Losses (1) (8)
Total Estimated Fair Value $ 181 $ 1,378