Accumulated Other Comprehensive Income (Loss) (Income (Expense) Effect of Reclassifications) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Affected Line Item on the Statements of Income
Interest Expense	$ (666)	$ (513)	$ (918)
Other Income (Expense) - net	(40)	54	15
Total Pre-tax	924	915	521
Income Taxes	(184)	(201)	(503)
Income (Loss) from Discontinued Operations (net of income taxes)	0	42	(1,498)
Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business
Affected Line Item on the Statements of Income
Income Taxes	0	0	(660)
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	(3,578)
Income from Discontinued Operations, before Income Tax	0	0	(4,238)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Total After-Tax	(1)	(21)	(3,731)
Qualifying Derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Total Pre-tax	(3)	(3)	(30)
Income Taxes	0	1	5
Total After-Tax	(3)	(2)	(25)
Qualifying Derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Interest Expense	(3)	(3)	11
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	(2)
Qualifying Derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	39
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business
Affected Line Item on the Statements of Income
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	(3,577)
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Total Pre-tax	1	(27)	(162)
Income Taxes	1	8	34
Total After-Tax	2	(19)	(128)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Total Pre-tax	(2)	(3)	(3)
Defined Benefit Plans [Member] | Net Actuarial Loss [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income
Total Pre-tax	3	(24)	(159)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business
Affected Line Item on the Statements of Income
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	(646)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business
Affected Line Item on the Statements of Income
Income (Loss) from Discontinued Operations (net of income taxes)	$ 0	$ 0	$ (15)