Accumulated Other Comprehensive Income (Loss) - Income (Expense) Effect of Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Affected Line Item on the Statements of Income [Line Items]
Interest Expense	$ (136)	$ (183)	$ (361)	$ (810)
Other Income (Expense) - net	10	12	36	25
Income Tax Expense (Benefit)	(41)	(51)	(147)	(455)
Income (Loss) from Discontinued Operations (net of income taxes)	0	(2)	0	(1,490)
Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K. Utility Business [Member]
Affected Line Item on the Statements of Income [Line Items]
Income Tax Expense (Benefit)	0	0	0	(660)
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	0	(3,578)
Income before income taxes	0	0	0	(4,238)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-tax	(4)	(20)	(15)	(3,722)
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K. Utility Business [Member]
Affected Line Item on the Statements of Income [Line Items]
Income before income taxes	0	0	0	(3,577)
Defined Benefit Plans [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Income (Loss) from Continuing Operations before Income Taxes	(7)	(26)	(20)	(150)
Income Tax Expense (Benefit)	3	7	6	31
Total After-tax	(4)	(19)	(14)	(119)
Defined Benefit Plans [Member] | Prior Service Costs [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Income (Loss) from Continuing Operations before Income Taxes	(2)	(12)	(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 [Line Items]
Income (Loss) from Continuing Operations before Income Taxes	(5)	(14)	(17)	(147)
Foreign currency translation adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K. Utility Business [Member]
Affected Line Item on the Statements of Income [Line Items]
Income before income taxes	0	0	0	(646)
Unrealized gains (losses) on qualifying derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K. Utility Business [Member]
Affected Line Item on the Statements of Income [Line Items]
Income before income taxes	0	0	0	(15)
Unrealized gains (losses) on qualifying derivatives [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Income (Loss) from Continuing Operations before Income Taxes	0	(1)	(2)	(29)
Income Tax Expense (Benefit)	0	0	1	4
Total After-tax	0	(1)	(1)	(25)
Unrealized gains (losses) on qualifying derivatives [Member] | Interest Rate Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Interest Expense	0	(1)	(2)	12
Income (Loss) from Discontinued Operations (net of income taxes)	0	0	0	(2)
Unrealized gains (losses) on qualifying derivatives [Member] | Cross Currency Swaps [Member] | Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Income (Loss) from Discontinued Operations (net of income taxes)	$ 0	$ 0	$ 0	$ (39)