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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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-term borrowings          
Short-term borrowings     $ 14,000,000 $ 34,000,000  
Revolving credit facility, maximum borrowing capacity $ 4,000,000,000        
Repayments of other short-term borrowings     0 0 $ 3,000,000,000
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%
May 2018 term loan credit agreement | Term loan facilities          
Short-term borrowings          
Repayments of other short-term borrowings   $ 3,000,000,000      
Term loan credit agreement term   364 days