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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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