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Stockholders' Equity - New Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU | $ (4) | $ 66
Accumulated deficit |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU | $ (4) | 175
Accumulated other comprehensive loss |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU |  | (109)
Accounting Standards Update 2017-05 | Accumulated deficit |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU |  | 66
Accounting Standards Update 2018-02 | Accumulated deficit |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU |  | 109
Accounting Standards Update 2018-02 | Accumulated other comprehensive loss |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Cumulative effect of adoption of ASU |  | $ (109)

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