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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | $ (15) | $ 12 | $ (8)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | 4 | (8) | 1
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (11) | 4 | (7)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 9 | 42 | 13
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (3) | (16) | (5)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 6 | 26 | 8
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 6 | 26 | 8
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax | (20) | (16) | (17)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 6 | 4 | 5
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (14) | (12) | (12)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (14) | (12) | (12)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax | (4) | (14) | (4)
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | 1 | 4 | 1
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | (3) | (10) | (3)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (3) | (10) | (3)
Net Gains (Losses) on Trust Investments [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax | 9 | 42 | 13
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (3) | (16) | (5)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 6 | 26 | 8
Interest Expense [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax | (4) | (14) | (4)
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | 1 | 4 | 1
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | (3) | (10) | (3)
Non-Operating Pension and OPEB Credits (Costs) [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 21 | 24 | 26
Amortization of Prior Service (Cost) Credit, Tax | (6) | (7) | (7)
Amortization of Prior Service (Cost) Credit, After-Tax | 15 | 17 | 19
Amortization of Actuarial Loss, Pre-Tax | (41) | (40) | (43)
Amortization of Actuarial Loss, Tax | 12 | 11 | 12
Amortization of Actuarial Loss, After-Tax | $ (29) | $ (29) | $ (31)

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