v3.20.4
Debt, Credit Facilities, and Commitments and Contingencies - Short-Term Borrowings (Details) - USD ($)
1 Months Ended 12 Months Ended
Aug. 31, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Short-term borrowings          
Short-term borrowings     $ 34,000,000 $ 0  
Revolving credit facility, maximum borrowing capacity $ 4,000,000,000.0        
Repayments of other short-term borrowings     0 3,000,000,000 $ 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 $ 0  
Weighted-average interest rate on commercial paper (as a percent)     1.80% 2.50% 2.00%
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