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Share-Based Compensation - Performance Share Unit Breakout (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018
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Performance Share Units [Member] | Award Year 2018, Payable 2019, 2020 and 2021 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 3,992,358 |
Fair Value | $ 18 | $ 12
Vested Liability | $ 0 |
Performance Share Units [Member] | Award Year 2017, Payable 2020 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 1,217,774 |
Fair Value | $ 6 | 8
Vested Liability | $ 4 |
Performance Share Units [Member] | Award Year 2016, Payable 2019 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 2,348,893 |
Fair Value | $ 11 | 10
Vested Liability | $ 10 |
Cash Restricted Stock Units [Member] | Award Year 2018, Payable 2019, 2020 and 2021 [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 16,034,295 |
Fair Value | $ 72 | $ 48
Vested Liability | $ 0 |

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- Definition Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79507207&loc=d3e4534-113899 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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