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Debt (Tables)
6 Months Ended
Jun. 30, 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 June 30,Six Months Ended June 30,
2021202020212020
Weighted average commercial paper outstanding$65 $808 $41 $632 
Weighted average interest rate of commercial paper outstanding0.17 %1.63 %0.18 %1.39 %