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United Kingdom Energy Crisis and Impairment Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Impairment charges | $ 495 |  | $ 495 |  |
Goodwill impairment | 259 | $ 0 | 259 | $ 0 |
Long-lived and intangible asset impairment | 236 | $ 0 | 236 | $ 0 |
Goodwill | 2,116 |  | 2,116 |  | $ 2,374
U.K. |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Long-lived and intangible asset impairment |  |  | 50 |  |
Goodwill | 26 |  | 26 |  |
Long-lived assets | $ 450 |  | $ 450 |  |
U.K. | Valuation Technique, Discounted Cash Flow | Measurement Input, Discount Rate |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Asset impairment test, measurement input | 0.1125 |  | 0.1125 |  |

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