Stock-Based Compensation - Restricted Stocks, Additional Information (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Ownership Plan (ESOP) Disclosures
Stock-based compensation expense	$ 120	$ 123	$ 132
RSAs
Employee Stock Ownership Plan (ESOP) Disclosures
Total grant-date fair value			$ 16
Shares granted	0	0	0
Number of shares outstanding	0		0	868
RSUs
Employee Stock Ownership Plan (ESOP) Disclosures
Total grant-date fair value	$ 99	$ 107	$ 73
Shares granted	4,186	4,177	4,375
Number of shares outstanding	9,487	9,466	10,006	8,020
Stock-based compensation expense	$ 134
Weighted-average period over which expense is expected to be recognized	2 years 4 months 24 days

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

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