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Debt - Narrative (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Commercial Paper    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,000,000,000.0  
Commercial paper borrowings $ 715,000,000 $ 644,000,000
Weighted-average interest rate 0.21% 0.27%
U.S. $8.5 Billion Bridge Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 8,500,000,000  
Revolving Credit Facility    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 1,300,000,000