Short-Term Debt (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Short-term Debt [Line Items]
Amount outstanding at period end	$ 0	$ 813
Commercial Paper
Short-term Debt [Line Items]
Borrowing limit	3,550	3,550
Amount outstanding at period end	0	813
Average amount outstanding	190	552
Maximum amount outstanding	$ 613	$ 1,357
Weighted average interest rate, computed on a daily basis	5.35%	1.47%
Weighted average interest rate at period end		4.66%