Accumulated Other Comprehensive Income (Loss) - Income (Expense) Effect of Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Affected Line Item on the Statements of Income [Line Items]
Interest Expense	$ (118)	$ (474)	$ (225)	$ (627)
Other Income (Expense) - net	26	13	26	13
Income Tax Expense (Benefit)	(32)	(345)	(106)	(404)
Income (Loss) from Discontinued Operations (net of income taxes)		555	0	(1,488)
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	(660)	0	(660)
Income (Loss) from Discontinued Operations (net of income taxes)	0	(3,578)	0	(3,578)
Income before income taxes	0	(4,238)	0	(4,238)
Amounts Reclassified From Accumulated Other Comprehensive Income [Member]
Affected Line Item on the Statements of Income [Line Items]
Total After-tax	(6)	(3,637)	(11)	(3,702)
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	(3,577)	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	(8)	(62)	(13)	(124)
Income Tax Expense (Benefit)	2	2	3	24
Total After-tax	(6)	(60)	(10)	(100)
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	0	9	(1)	9
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	(8)	(71)	(12)	(133)
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	(646)	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	(15)	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	(1)	11	(2)	(28)
Income Tax Expense (Benefit)	1	(10)	1	4
Total After-tax	0	1	(1)	(24)
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	(1)	14	(2)	13
Income (Loss) from Discontinued Operations (net of income taxes)	0	(1)	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	$ (2)	$ 0	$ (39)