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Short-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Short-term Debt [Line Items]    
Amount outstanding at period end $ 136 $ 1,005
Commercial Paper    
Short-term Debt [Line Items]    
Borrowing limit 3,100 3,100
Amount outstanding at period end 136 1,005
Average amount outstanding 554 1,399
Maximum amount outstanding $ 1,136 $ 2,054
Weighted average interest rate, computed on a daily basis 1.05% 0.57%
Weighted average interest rate at period end 1.90% 0.31%