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Debt (Tables)
3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The weighted average commercial paper outstanding and its related interest rates are as follows (in millions, except percentages):
Three Months Ended March 31,
20212020
Weighted average commercial paper outstanding$17 $456 
Weighted average interest rate of commercial paper outstanding0.19 %0.96 %