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Available-for-Sale Debt Securities - Summary of Available-for-Sale Debt Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses $ (59)  
Less than 12 Months, Fair Value 5,868  
12 Months or Greater, Unrealized Losses 0  
12 Months or Greater, Fair Value 6  
Gross Unrealized Losses (59)  
Total Estimated Fair Value 5,874  
Corporate debt securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses (55) $ (1)
Less than 12 Months, Fair Value 5,639 1,866
12 Months or Greater, Unrealized Losses 0 0
12 Months or Greater, Fair Value 0 4
Gross Unrealized Losses (55) (1)
Total Estimated Fair Value 5,639 $ 1,870
Residential mortgage and asset-backed securities    
Available-for-Sale Debt Securities    
Less than 12 Months, Unrealized Losses (4)  
Less than 12 Months, Fair Value 229  
12 Months or Greater, Unrealized Losses 0  
12 Months or Greater, Fair Value 6  
Gross Unrealized Losses (4)  
Total Estimated Fair Value $ 235