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Share-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock option grant price as percent of market price |  | 100.00% |  |
Award vesting period |  | 3 years |  |
Award vesting rights percentage |  | 33.00% |  |
Stock option contractual term |  | 10 years |  |
Number of shares available for grant |  | 16 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 1 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year |  |
RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Award vesting rights percentage |  | 33.00% |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 17 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 9 months 18 days |  |
Estimated forfeiture rate |  | 11.54% |  |
Compensation cost not yet recognized related to current year grants per year |  | $ 16 |  |
Period before award can be converted to shares | 2 years |  |  |
Weighted Average Grant Date Fair Value |  | $ 9.42 | $ 12.03 | $ 14.60
PSUs With Market Conditions |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award, percent with market condition |  | 50.00% |  |
Weighted Average Grant Date Fair Value |  | $ 9.41 | $ 8.22 | $ 15.19
PSUs with Performance Condition |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award, percent with performance condition |  | 50.00% |  |
Performance stock units vesting rule measurement period |  | 3 years |  |
Performance Cash Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cost not yet recognized related to current year grants |  | $ 7 |  |
Compensation cost not yet recognized related to current year grants per year |  | $ 2 |  |
Performance stock units vesting rule measurement period |  | 3 years |  |
Weighted Average Grant Date Fair Value |  | $ 1.04 |  |
PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | $ 7 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 9 months 18 days |  |
Estimated forfeiture rate |  | 12.28% |  |
Cost not yet recognized related to current year grants |  | $ 6 |  |
Period of straight-line expense, 2015 PSUs |  | 3 years |  |
Compensation cost not yet recognized related to current year grants per year |  | $ 2 |  |
Weighted Average Grant Date Fair Value |  | $ 9.41 |  |
PSUs | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award payout range |  |  | 0.00% | 0.00%
PSUs | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award payout range |  | 100.00% | 200.00% | 200.00%

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- Definition The aggregate unrecognized cost of equity-based awards made to employees during the current period under equity-based compensation awards that have yet to vest. + References No definition available. + Details
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- Definition The unrecognized cost of equity-based awards made to employees during the current period under equity-based compensation expected to vest each of the following three years. + References No definition available. + Details
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- Definition Estimated rate of forfieture applied stock option expense for the Non-Officer population of stock option awards + References No definition available. + Details
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- Definition The authorized price of stock options that may be granted by the Company, as a percent of the grant date market price. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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