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Significant Accounting Policies (Intangible Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (103) | $ (88)
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 13 | 8
Long-term intangible assets |  |
Gross Carrying Value | 259 | 254
Accumulated Amortization | (103) | (88)
Net Carrying Value | 156 | 166
Carbon offsets |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 10 | 6
Renewable energy credits |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 2 | 2
Other |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Intangible assets not subject to amortization | 1 | 0
Contract intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 246 | 246
Accumulated Amortization | (103) | (88)
Net Carrying Value | 143 | 158
Long-term intangible assets |  |
Accumulated Amortization | $ (103) | $ (88)
Contract intangibles | Minimum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives | 12 years |
Contract intangibles | Maximum |  |
Finite-Lived Intangible Assets [Line Items] |  |
Useful Lives | 26 years |

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