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Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. | $ 5 |  | $ 45 |  |  |
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. | 100 |  | 700 |  |  |
Stock Repurchased During Period, Shares | 28,243 | [1] | 26,561 | [2] | 67,963 | [2]
Stock Repurchased During Period, Value | $ 2,394 | [1] | $ 1,915 | [2] | $ 5,447 | [2]
August 2018 [Domain] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 10,003 |  |  |  |  |
November 2017 [Domain] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 18,240 |  | 0 |  | 0 |
Stock Repurchased During Period, Value | $ 1,500 |  | $ 0 |  | $ 0 |
November 2016 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 26,561 |  | 1,337 |
Stock Repurchased During Period, Value | $ 0 |  | $ 1,915 |  | $ 85 |
December 2015 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 13,368 |
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 933 |
May 2016 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 50,435 |
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 4,200 |
March 2016 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 2,823 |
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 229 |
August 2018 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchased During Period, Shares |  |  | 0 |  | 0 |
Stock Repurchased During Period, Value | 894 |  | $ 0 |  | $ 0 |
August 2018 [Member] |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | 2,000 |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,100 |  |  |  |  |
[1] | Includes the effect of $5 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2018 but settlement dates subsequent to December 31, 2018.
[2] | 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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