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Debt - Letters of Credit, Borrowings and Repayments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Debt      
Outstanding letters of credit $ 130   $ 129
Credit facilities and commercial paper program      
Debt      
Total borrowings 14,200 $ 9,600  
Total repayments $ 14,800 $ 9,600