Financial Instruments and Derivatives (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt instrument [Line Items]
Initial margin collateral receivable	$ 538	$ 491
Proceeds from hedge, financing activities	3,200
Short Term Financing
Debt instrument [Line Items]
Short-term committed line of credit	200
Long Term Financing
Debt instrument [Line Items]
Short-term committed line of credit	$ 1,000