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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Less than 12 months    
Fair Value $ 42 $ 338
Unrealized Losses 0 3
12 months or more    
Fair Value 498 666
Unrealized Losses 5 18
Total    
Fair Value 540 1,004
Unrealized Losses 5 21
Corporate bonds    
Less than 12 months    
Fair Value 20 280
Unrealized Losses 0 3
12 months or more    
Fair Value 342 391
Unrealized Losses 3 11
Total    
Fair Value 362 671
Unrealized Losses 3 14
Asset-backed securities    
Less than 12 months    
Fair Value   6
Unrealized Losses   0
12 months or more    
Fair Value   38
Unrealized Losses   1
Total    
Fair Value   44
Unrealized Losses   1
U.S. governmental agency mortgage-backed securities    
Less than 12 months    
Fair Value 22 52
Unrealized Losses 0 0
12 months or more    
Fair Value 156 223
Unrealized Losses 2 5
Total    
Fair Value 178 275
Unrealized Losses $ 2 5
Commercial    
Less than 12 months    
Fair Value   0
Unrealized Losses   0
12 months or more    
Fair Value   14
Unrealized Losses   1
Total    
Fair Value   14
Unrealized Losses   $ 1