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Accumulated Other Comprehensive Income (Loss) (After-tax Changes by Component) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | $ (157) | $ (4,220) | $ (4,358)
Amounts arising during the year | 12 | 332 | (94)
Reclassifications from AOCI | 21 | 153 | 232
Net OCI during the year | 33 | 4,063 | 138
Balance at end of year | (124) | (157) | (4,220)
Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | 3,578 |
Foreign Currency Translation Adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 0 | (1,158) | (1,425)
Amounts arising during the year | 0 | 372 | 267
Reclassifications from AOCI | 0 | 0 | 0
Net OCI during the year | 0 | 1,158 | 267
Balance at end of year | 0 | 0 | (1,158)
Foreign Currency Translation Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | 786 |
Qualifying Derivatives [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 1 | 0 | (5)
Amounts arising during the year | 0 | (39) | (19)
Reclassifications from AOCI | 2 | 25 | 24
Net OCI during the year | 2 | 1 | 5
Balance at end of year | 3 | 1 | 0
Qualifying Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | 15 |
Equity Investees AOCI [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | 0 | 0 | 0
Amounts arising during the year | 2 | 0 | 0
Reclassifications from AOCI | 0 | 0 | 0
Net OCI during the year | 2 | 0 | 0
Balance at end of year | 2 | 0 | 0
Equity Investees AOCI [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | 0 |
Prior Service Costs [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (6) | (16) | (18)
Amounts arising during the year | (1) | 0 | (1)
Reclassifications from AOCI | 2 | 2 | 3
Net OCI during the year | 1 | 10 | 2
Balance at end of year | (5) | (6) | (16)
Prior Service Costs [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | 8 |
Defined Benefit Plans Actuarial Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance at beginning of year | (152) | (3,046) | (2,910)
Amounts arising during the year | 11 | (1) | (341)
Reclassifications from AOCI | 17 | 126 | 205
Net OCI during the year | 28 | 2,894 | (136)
Balance at end of year | $ (124) | (152) | $ (3,046)
Defined Benefit Plans Actuarial Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) due to Sale of U.K, Utility Business |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassifications from AOCI |  | $ 2,769 |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI https://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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