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Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Assets      
Available-for-sale investment securities $ 163   $ 351
Liabilities      
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax 0 $ 0  
Fair Value, Recurring [Member]      
Assets      
Cash equivalents 1,254   641
Available-for-sale investment securities 163   351
Derivative Asset 1   8
Fair Value, Recurring [Member] | Level 1 [Member]      
Assets      
Cash equivalents 1,114   611
Available-for-sale investment securities 0   0
Derivative Asset 0   0
Fair Value, Recurring [Member] | Level 2 [Member]      
Assets      
Cash equivalents 140   30
Available-for-sale investment securities 163   351
Derivative Asset 1   8
Fair Value, Recurring [Member] | Level 3 [Member]      
Assets      
Cash equivalents 0   0
Available-for-sale investment securities 0   0
Derivative Asset $ 0   $ 0