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Debt - Narrative (Details) - USD ($)
Jun. 15, 2021
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Commercial paper   $ 1,000,000,000 $ 210,000,000
Short-term debt   1,041,000,000 778,000,000
Long-term line of credit   $ 0 $ 0
Commercial Paper      
Debt Instrument [Line Items]      
Weighted average interest rate   0.51% 0.14%
Line of Credit      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 2,500,000,000 $ 2,500,000,000
1.75% Notes      
Debt Instrument [Line Items]      
Short-term debt     $ 568,000,000
Stated interest rate     1.75%
3.375% Notes Due September 15, 2021      
Debt Instrument [Line Items]      
Stated interest rate 3.375%    
Repayment of debt $ 350,000,000