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Segments - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) Segment	Sep. 30, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment			3
Operating Income (Loss)	$ 623	$ (4,342)	$ 1,638	$ (3,978)
Europe [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	$ 394	$ 312	1,074	$ 1,058
Europe [Member] | Sales Revenue, Net [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)			$ 1

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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