Income And Other Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income and Other Taxes [Line Items]
Net deferred income tax expense (credits)/changes for tax rate and law changes		$ (28)	$ 24	$ 30
Effective income tax rate reconciliation, European tax on energy sector, amount	$ 1,800		$ 200
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	21.00%	21.00%
Valuation Allowance [Abstract]
Asset valuation allowances		$ 2,516	$ 2,641
Valuation allowance change		$ (125)
Potential percentage increase in unrecognized tax benefits		20.00%
Potential percentage decrease in unrecognized tax benefits		30.00%
Interest expense on income tax reserves		$ 142	60	$ 16
Interest payable on income tax reserves		275	$ 134
Change in net provisions [Member]
Valuation Allowance [Abstract]
Valuation allowance change		41
Effects of foreign currency translation [Member]
Valuation Allowance [Abstract]
Valuation allowance change		$ (166)