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Debt, Credit Facilities, and Commitments and Contingencies - Short-Term Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2019
Mar. 31, 2019
May 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Short-term borrowings            
Short-term borrowings       $ 0 $ 3,699,000,000  
Revolving credit facility, maximum borrowing capacity $ 4,000,000,000.0          
Repayments of other short-term borrowings       3,000,000,000 0 $ 0
Revolving credit facility            
Short-term borrowings            
Revolving credit facility term 5 years          
Revolving credit facility outstanding       0 0  
Commercial Paper            
Short-term borrowings            
Short-term borrowings       $ 0 $ 699,000,000  
Weighted-average interest rate on commercial paper (as a percent)       2.50% 2.00% 1.30%
May 2018 term loan credit agreement | Term loan facilities            
Short-term borrowings            
Repayments of other short-term borrowings   $ 3,000,000,000.0        
Term loan credit agreement term     364 days