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Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Value of share repurchases with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. |  |  | $ 45 |  |
Number of shares repurchased with trade dates prior to current reporting date but with settlement dates subsequent to the current reporting date. |  |  | 700 |  |
Stock Repurchased During Period, Shares | 26,561 | [1] | 67,963 | [1] | 15,942
Stock Repurchased During Period, Value | $ 1,915 | [1] | $ 5,447 | [1] | $ 1,200
November 2017 [Domain] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 0
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 0
November 2016 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 26,561 |  | 1,337 |  | 0
Stock Repurchased During Period, Value | $ 1,915 |  | $ 85 |  | $ 0
December 2015 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 13,368 |  | 932
Stock Repurchased During Period, Value | $ 0 |  | $ 933 |  | $ 67
May 2016 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 50,435 |  | 0
Stock Repurchased During Period, Value | $ 0 |  | $ 4,200 |  | $ 0
March 2016 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 2,823 |  | 0
Stock Repurchased During Period, Value | $ 0 |  | $ 229 |  | $ 0
November 2014 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 13,231
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 1,000
November 2013 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 1,779
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 133
November 2017 [Domain] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | 1,500 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,500 |  |  |  |
[1] | 2017 amount excludes and 2016 amount includes the effect of $45 million in share repurchases (0.7 million shares) with trade dates prior to December 31, 2016 but settlement dates subsequent to December 31, 2016.

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