Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award
Shares of common stock available for grants	18,000,000
Stock-based compensation	$ 77	$ 75	$ 52
Deferred income tax benefits on stock-based compensation	$ 28	$ 29	$ 19
Weighted-average fair value of options granted	$ 10.95	$ 7.39	$ 7.89
Excess tax benefits	$ 19	$ 37	$ 37
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%
Total intrinsic value of options exercised	$ 55	83	79
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares vesting period	3 years
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%
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award
Total fair value of restricted shares and restricted share units	$ 83	$ 99	$ 102

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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- Definition

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

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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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.

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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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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 share-based compensation awards.

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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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