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Share-Based Compensation - Narrative (Details) - USD ($) shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 66	$ 108
Unrecognized compensation cost	$ 410
Weighted-average period unrecognized compensation cost will be recognized (in years)	2 years 4 months 24 days
Share-based awards, stock options, exercised (in shares)	1,598
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based awards, stock options, exercised (in shares)	1,600	900

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

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