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Share-Based Compensation - Performance Share Unit Breakout (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Performance Share Units | Award Year 2019, Payable 2020, 2021 and 2022 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 4,887,868 |
Fair Value | $ 12 | $ 15
Vested Liability | $ 0 |
Performance Share Units | Award Year 2018, Payable 2020 and 2021 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 2,418,281 |
Fair Value | $ 5 | 7
Vested Liability | $ 0 |
Performance Share Units | Award Year 2017, Payable 2020 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 1,174,973 |
Fair Value | $ 2 | 8
Vested Liability | $ 1 |
Cash Restricted Stock Units | Award Year 2018, Payable 2020 and 2021 |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Units | 9,468,697 |
Fair Value | $ 18 | $ 29
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=116855982&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 Number of shares authorized for issuance under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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