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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 6 Months Ended
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Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
|  |  | Three Months Ended June 30, 2022 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2022 |  | $ | (5) |  |  | $ | (355) |  |  | $ | (50) |  |  | $ | (410) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (53) |  |  | (53) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 1 |  |  | 7 |  |  | 8 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 1 |  |  | (46) |  |  | (45) |  |
| Balance as of June 30, 2022 |  | $ | (5) |  |  | $ | (354) |  |  | $ | (96) |  |  | $ | (455) |  |
|  |  | Three Months Ended June 30, 2021 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of March 31, 2021 |  | $ | (8) |  |  | $ | (542) |  |  | $ | 8 |  |  | $ | (542) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | 16 |  |  | 16 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | 4 |  |  | — |  |  | 4 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | — |  |  | 4 |  |  | 16 |  |  | 20 |  |
| Balance as of June 30, 2021 |  | $ | (8) |  |  | $ | (538) |  |  | $ | 24 |  |  | $ | (522) |  |
|  |  | Six Months Ended June 30, 2022 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2021 |  | $ | (6) |  |  | $ | (355) |  |  | $ | 11 |  |  | $ | (350) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (118) |  |  | (118) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 1 |  |  | 11 |  |  | 13 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | 1 |  |  | (107) |  |  | (105) |  |
| Balance as of June 30, 2022 |  | $ | (5) |  |  | $ | (354) |  |  | $ | (96) |  |  | $ | (455) |  |
|  |  | Six Months Ended June 30, 2021 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2020 |  | $ | (9) |  |  | $ | (545) |  |  | $ | 50 |  |  | $ | (504) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (24) |  |  | (24) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 7 |  |  | (2) |  |  | 6 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | 7 |  |  | (26) |  |  | (18) |  |
| Balance as of June 30, 2021 |  | $ | (8) |  |  | $ | (538) |  |  | $ | 24 |  |  | $ | (522) |  |
Reclassifications out of Accumulated Other Comprehensive Income |
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
|  |  |  | June 30, 2022 |  | June 30, 2022 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | (1) |  |  | $ | 1 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 1 |  |  | $ | (1) |  |
| Total Cash Flow Hedges | (1) |  |  | 1 |  |  | — |  |  | (2) |  |  | 1 |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 5 |  |  | (2) |  |  | 3 |  |  | 10 |  |  | (3) |  |  | 7 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (6) |  |  | 2 |  |  | (4) |  |  | (11) |  |  | 3 |  |  | (8) |  |
| Total Pension and OPEB Plans | (1) |  |  | — |  |  | (1) |  |  | (1) |  |  | — |  |  | (1) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | (12) |  |  | 5 |  |  | (7) |  |  | (18) |  |  | 7 |  |  | (11) |  |
| Total Available-for-Sale Debt Securities | (12) |  |  | 5 |  |  | (7) |  |  | (18) |  |  | 7 |  |  | (11) |  |
| Total |  |  | $ | (14) |  |  | $ | 6 |  |  | $ | (8) |  |  | $ | (21) |  |  | $ | 8 |  |  | $ | (13) |  |
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Six Months Ended |
|  |  |  | June 30, 2021 |  | June 30, 2021 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | (1) |  |  | $ | 1 |  |  | $ | — |  |  | $ | (2) |  |  | $ | 1 |  |  | $ | (1) |  |
| Total Cash Flow Hedges | (1) |  |  | 1 |  |  | — |  |  | (2) |  |  | 1 |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 6 |  |  | (2) |  |  | 4 |  |  | 11 |  |  | (3) |  |  | 8 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (11) |  |  | 3 |  |  | (8) |  |  | (21) |  |  | 6 |  |  | (15) |  |
| Total Pension and OPEB Plans | (5) |  |  | 1 |  |  | (4) |  |  | (10) |  |  | 3 |  |  | (7) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | 1 |  |  | (1) |  |  | — |  |  | 4 |  |  | (2) |  |  | 2 |  |
| Total Available-for-Sale Debt Securities | 1 |  |  | (1) |  |  | — |  |  | 4 |  |  | (2) |  |  | 2 |  |
| Total |  |  | $ | (5) |  |  | $ | 1 |  |  | $ | (4) |  |  | $ | (8) |  |  | $ | 2 |  |  | $ | (6) |  |

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