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Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | $ (49) | $ (15) | $ 12
Tax (Expense) Benefit | 19 | (4) | 8
After-Tax Amount | (30) | (11) | 4
Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (5) | (4) | (14)
Tax (Expense) Benefit | 2 | (1) | (4)
After-Tax Amount | (3) | (3) | (10)
Pension and OPEB Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (1) | (20) | (16)
Tax (Expense) Benefit | 0 | (6) | (4)
After-Tax Amount | (1) | (14) | (12)
Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (43) | 9 | 42
Tax (Expense) Benefit | 17 | 3 | 16
After-Tax Amount | (26) | 6 | 26
Interest Expense | Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (5) | (4) | (14)
Tax (Expense) Benefit | 2 | (1) | (4)
After-Tax Amount | (3) | (3) | (10)
Amortization of Prior Service (Cost) Credit | Pension and OPEB Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | 21 | (21) | (24)
Tax (Expense) Benefit | (6) | (6) | (7)
After-Tax Amount | 15 | (15) | (17)
Amortization of Actuarial Loss | Pension and OPEB Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (22) | 41 | 40
Tax (Expense) Benefit | 6 | 12 | 11
After-Tax Amount | (16) | 29 | 29
Net Gains (Losses) on Trust Investments | Available-for-Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Pre-Tax Amount | (43) | 9 | 42
Tax (Expense) Benefit | 17 | 3 | 16
After-Tax Amount | $ (26) | $ 6 | $ 26

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- Definition Amount before tax of reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 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 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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