Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock available for grants	11,000,000
Stock-based compensation	$ 147	$ 96	$ 41
Deferred income tax benefits on stock-based compensation	$ 32	$ 11	$ 13
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Stock options term, years	10 years
Vesting percentage at the end of each of the first two 12 months period	30.00%
Vesting percentage at the end of third 12 months period	40.00%
Weighted-average fair value of options granted	$ 15.92	$ 13.54	$ 13.56
Total intrinsic value of options exercised	$ 62	$ 62	$ 22
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares vesting period	3 years
Total fair value of restricted share units distributed	$ 62	$ 75	$ 65
Performance-based restricted share units \| Minimum \| Share-based Compensation Award
Share-based Compensation Arrangement by Share-based Payment Award
Number of performance-based share units that vest, percentage	0.00%
Performance-based restricted share units \| Maximum \| Share-based Compensation Award
Share-based Compensation Arrangement by Share-based Payment Award
Number of performance-based share units that vest, percentage	200.00%

Share Based Compensation Arrangement By Share Based Payment Award Vesting Percentage Year Three

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Share Based Compensation Arrangement By Share-based Payment Award, Vesting Percentage Years One and Two

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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 noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Percentage of vesting of award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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