Borrowings and Lines of Credit (Narrative) (Details) - USD ($) $ in Billions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Debt Instrument [Line Items]
Commercial paper borrowings outstanding	$ 0.0		$ 0.0
New borrowings of commercial paper	0.0	$ 0.0
Repayments of commercial paper	$ 0.0	$ 0.0
Average maturity of long-term debt	12 years
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5.0
Borrowings outstanding	0.0
Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 5.0