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Debt Revolver (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Other Long-term Debt, Noncurrent $ 5,536   $ 5,536
Line of Credit Facility, Expiration Date May 28, 2023    
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000 $ 3,400  
Line of Credit Facility, Maximum Borrowing Capacity $ 0    
Maximum [Member]      
Debt Instrument [Line Items]      
Ratio of Indebtedness to Net Capital 0.65    
Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity $ 0    
Ratio of Indebtedness to Net Capital 0.31