Stock-Based Compensation - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock-Based Compensation
Stock option expense	$ 0	$ 0	$ 1
Restricted stock and unit awards expense	122	90	77
Total stock-based compensation expense	122	90	78
Tax benefit	$ 20	$ 15	$ 13

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

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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-Publisher FASB
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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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Amount of noncash expense for option under share-based payment arrangement.

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