Share-Based Compensation - Performance Share Unit Breakout (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
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

Value of stock issued under share-based plans to employees or officers which is the unearned portion, accounted for under the fair value method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 35
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-URI http://asc.fasb.org/extlink&oid=116855982&loc=d3e4534-113899

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

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Number of shares authorized for issuance under share-based payment arrangement.

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