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Stock Compensation - Additional Information (Details) - USD ($) shares in Millions, $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Apr. 27, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of additional shares authorized |  | 3.7 |  |  |  |  |
Accrual for cash-settled awards | $ 7 |  | $ 5 |  | $ 7 | $ 5 |
Total unrecognized compensation cost related to nonvested awards granted and expected to vest | $ 22 |  |  |  | 22 |  |
Weighted-average period in which the total unrecognized compensation cost is expected to be recognized | 1 year 8 months 12 days |  |  |  |  |  |
Cash award vesting period | 3 years |  | 3 years | 3 years |  |  |
Expenses for annual cash incentive awards |  |  |  |  | $ 77 | $ 41 | $ 35
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  |  | 0.6 |  |
Stock vesting period (in years) |  |  |  |  | 3 years |  |
Stock Option And Stock Appreciation Rights [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock vesting period (in years) |  |  |  |  | 3 years |  |
Option maximum term (in years) |  |  |  |  | 10 years |  |
Outstanding options and SARs, aggregate intrinsic value | $ 15 |  |  |  | $ 15 |  |
Outstanding options and SARs, weighted-average remaining contractual term | 3 years 10 months 3 days |  |  |  |  |  |
Performance Share Units [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock vesting period (in years) |  |  |  |  | 3 years |  |
Omnibus Incentive Plan 2017 [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares of common stock available for future grant | 6.3 |  |  |  | 6.3 |  |

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