Stock Compensation Plans - Stock-based Compensation Expense and Cash Activity (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-based compensation expense recognized	$ 31	$ 27	$ 16
Tax benefit	(8)	(7)	(4)
After-tax stock-based compensation expense	23	20	12
Cash payments to settle SARs	0	0	1
Cash received from stock option exercises	$ 0	$ 2	$ 9

Cash Payment To Settle Sars and Performance Share Units

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

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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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