Stock-Based Compensation Stock Compensation (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining Weighted-Average Recognition Period	6 months 21 days
OIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant	20,000,000
Shares authorized for future grants	14,000,000
Tax Benefit from Compensation Expense	$ (4)	$ (1)
Intrinsic value of stock options	21	3
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	73	84	$ 83
Tax Benefit from Compensation Expense	$ (15)	$ (17)	$ (17)

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

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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Number of shares authorized for issuance under share-based payment arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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