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Shareholders' Deficit (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |
Shares Repurchased | 1,127 | [1] | 6,507 | [2]
Dollar Value of Shares Repurchased | $ 106 | [1] | $ 528 | [2]
Remaining Dollar Value of Shares that may be Repurchased | 1,000 |  |  |
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. | $ 2 |  | $ 30 |
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. | 20 |  | 400 |
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter | $ 5 |  |  |
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter | 50 |  |  |
November 2017 [Member] |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |
Shares Repurchased | 0 |  | 6,507 |
Dollar Value of Shares Repurchased | $ 0 |  | $ 528 |
Remaining Dollar Value of Shares that may be Repurchased | $ 0 |  |  |
August 2018 [Member] |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |
Shares Repurchased | 1,127 |  | 0 |
Dollar Value of Shares Repurchased | $ 106 |  | $ 0 |
Remaining Dollar Value of Shares that may be Repurchased | $ 1,000 |  |  |
[1] | Includes the effect of $2 million in share repurchases (0.02 million shares) with trade dates prior to March 31, 2019, but cash settlement dates subsequent to March 31, 2019 and excludes the effect of $5 million in share repurchases (0.05 million shares) with trade dates on, or prior to, December 31, 2018, but cash settlement dates subsequent to December 31, 2018.
[2] | Includes the effect of $30 million in share repurchases (0.4 million shares) with trade dates prior to March 31, 2018, but cash settlement dates subsequent to March 31, 2018.

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