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Investments in Debt and Equity Securities (Details 2) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months - Fair Value $ 65 $ 58
Less than 12 months - Unrealized losses 2 1
12 months or more - Fair Value 6 50
12 months or more - Unrealized losses 0 0
Total - Fair Value 71 108
Total - Unrealized losses 2 1
Corporate bonds    
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months - Fair Value 65 58
Less than 12 months - Unrealized losses 2 1
12 months or more - Fair Value 6 50
12 months or more - Unrealized losses 0 0
Total - Fair Value 71 108
Total - Unrealized losses $ 2 $ 1