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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Director deferred stock ownership plan amount to be credited to deferred stock accounts | 50.00% |  |
Share delivery term if elected | 5 years |  |
Award vesting period | 3 years |  |
Shares, granted (in shares) |  | 0 |
Total fair value of stock options, vested | $ 4 | $ 7 | $ 11
Employee withholding tax on share-based payments | $ (49) | $ (55) | $ (92)
Employee Stock Option |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Award expiration period | 10 years |  |
Employee Stock Option | Graded Vesting Method |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
Employee Stock Option | Ratable Vest One |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 12 months |  |
Percentage of compensation costs recognized | 33.33% |  |
Employee Stock Option | Ratable Vest Two |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 24 months |  |
Percentage of compensation costs recognized | 33.33% |  |
Employee Stock Option | Ratable Vest Three |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award cost recognition period | 36 months |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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