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Equity Incentive Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 17, 2014 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity Incentive Plans |  |  |  |
Compensation expense |  | $ 105 | $ 125 | $ 106
Share-based compensation arrangement by share-based payment award, recognized tax benefits |  | 17 | 22 | 22
Cash received from the exercise of options |  | 154 | 92 | 178
Tax benefit realized on options exercised and stock unrestricted |  | 43 | $ 28 | $ 96
Unrecognized compensation cost related to nonvested awards |  | $ 79 |  |
Common stock authorized for stock-based awards (in shares) |  | 110.8 |  |
Common stock reserved for further issuance (in shares) |  | 24.0 |  |
Nonqualified stock options |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 29 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 8 months 4 days |  |
Restricted stock units |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 21 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 8 months 8 days |  |
Performance stock awards |  |  |  |
Equity Incentive Plans |  |  |  |
Unrecognized compensation cost related to nonvested awards |  | $ 29 |  |
Expected period of recognition of unrecognized compensation cost |  | 1 year 6 months 18 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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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