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Equity Incentive Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 17, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity Incentive Plans |  |  |  |
Compensation expense |  | $ 106 | $ 80 | $ 81
Share-based compensation arrangement by share-based payment award, recognized tax benefits |  | 22 | 28 | 28
Cash received from the exercise of options |  | 178 | 187 | 187
Tax benefit realized on options exercised and stock unrestricted |  | 96 | $ 61 | $ 82
Unrecognized compensation cost related to nonvested awards |  | $ 84 |  |
Common stock authorized for stock-based awards (in shares) |  | 98.0 |  |
Common stock reserved for further issuance (in shares) |  | 18.3 |  |
Nonqualified stock options |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 26 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 8 months 1 day |  |
Restricted stock units |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 25 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 9 months 26 days |  |
Portion of awards vesting and unrestricting on second anniversary of grant date (as a percent) |  | 50.00% |  |
Portion of awards vesting and unrestricting on third and fourth anniversaries of grant date (as a percent) |  | 25.00% |  |
Performance stock awards |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 33 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 7 months 24 days |  |
Stock options |  |  |  |
Equity Incentive Plans |  |  |  |
Vesting period of options granted |  | 3 years |  |
Portion of awards vesting and unrestricting on second anniversary of grant date (as a percent) | 50.00% |  |  |
Portion of awards vesting and unrestricting on third and fourth anniversaries of grant date (as a percent) | 25.00% |  |  |
Expiration term for options |  | 10 years |  |

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- Definition The percentage of share-based awards that vest on the second anniversary of the grant date of the awards. + References No definition available. + Details
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- Definition The percentage of share-based awards that vest on the third and fourth anniversaries of the grant date of the awards. + References No definition available. + Details
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- Definition The period of time over 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, for awards granted prior to 2010. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + 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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&loc=d3e5070-113901 + Details
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