Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock available for grants	16,000,000
Stock-based compensation	$ 76	$ 77	$ 75
Deferred income tax benefits on stock-based compensation	$ 26	$ 28	$ 29
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	$ 12.21	$ 10.95	$ 7.39
Total intrinsic value of options exercised	$ 48	$ 55	$ 83
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares vesting period	3 years
Total fair value of restricted shares and restricted share units	$ 80	$ 83	$ 99
Performance-based restricted share units \| Minimum \| Share-based Compensation Award, Tranche Three
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, Tranche Three
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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- Definition

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

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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-Publisher FASB
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-Topic 230
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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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-Publisher FASB
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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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-Publisher FASB
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- Definition

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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- Definition

Percentage of vesting of share-based compensation awards.

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- Definition

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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