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Share-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 63	$ 84	$ 190	$ 286
Unrecognized compensation cost	$ 321		$ 321
Weighted-average period unrecognized compensation cost will be recognized (in years)			2 years 1 month 6 days
Share-based awards, stock options, exercised (in shares)			3,510
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards, stock options, exercised (in shares)			3,500	2,200

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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