Share-Based Compensation - Schedule of Share-Based Compensation (Details) - USD ($) $ 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]
Total share-based compensation	$ 29	$ 27	$ 95	$ 88
Capitalized share-based compensation	(1)	0	(4)	(4)
Total share-based compensation expense	28	27	91	84
Tax benefit associated with share-based compensation expense	3	2	30	21
Equity Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	28	26	92	86
Liability Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share-based compensation	$ 1	$ 1	$ 3	$ 2

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

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