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Shareholders' Deficit (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Sep. 30, 2017
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Shares Repurchased |  |  |  | 20,484 | [1] | 19,110 | [2]
Dollar Value of Shares Repurchased |  |  |  | $ 1,698 | [1] | $ 1,327 | [2]
Remaining Dollar Value of Shares that may be Repurchased | $ 1,802 |  |  | $ 1,802 |  |  |
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. | $ 14 | $ 24 |  |  |  |  |
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. | 200 | 300 |  |  |  |  |
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter |  |  | $ 45 |  |  |  |
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter |  |  | 700 |  |  |  |
November 2016 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Shares Repurchased |  |  |  | 0 |  | 19,110 |
Dollar Value of Shares Repurchased |  |  |  | $ 0 |  | $ 1,327 |
Remaining Dollar Value of Shares that may be Repurchased | $ 0 |  |  | $ 0 |  |  |
November 2017 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Shares Repurchased |  |  |  | 18,240 |  | 0 |
Dollar Value of Shares Repurchased |  |  |  | $ 1,500 |  | $ 0 |
Remaining Dollar Value of Shares that may be Repurchased | 0 |  |  | $ 0 |  |  |
August 2018 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Shares Repurchased |  |  |  | 2,244 |  | 0 |
Dollar Value of Shares Repurchased |  |  |  | $ 198 |  | $ 0 |
Remaining Dollar Value of Shares that may be Repurchased | 1,802 |  |  | 1,802 |  |  |
Stock Repurchase Program, Authorized Amount | $ 2,000 |  |  | $ 2,000 |  |  |
[1] | Includes the effect of $14 million in share repurchases (0.2 million shares) with trade dates prior to September 30, 2018, but cash settlement dates subsequent to September 30, 2018.
[2] | Includes the effect of $24 million in share repurchases (0.3 million shares) with trade dates on, or prior to, September 30, 2017, but cash settlement dates subsequent to September 30, 2017 and excludes the effect of $45 million in share purchases (0.7 million shares) with trades dates prior to December 31, 2016, but cash settlement dates subsequent to December 31, 2016.

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