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Shareholders' Equity (Details) - USD ($) shares in Thousands | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019
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. |  |  |  |  | $ 45,000,000 |  | $ 5,000,000
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. |  |  |  |  | 700 |  | 100
Stock Repurchased During Period, Shares | 7,788 | [1] | 28,243 | [1] | 26,561 | [2] |
Stock Repurchased During Period, Value | $ 810,000,000 | [1] | $ 2,394,000,000 | [1] | $ 1,915,000,000 | [2] |
November 2017 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 18,240 |  | 0 |  |
Stock Repurchased During Period, Value | $ 0 |  | $ 1,500,000,000 |  | $ 0 |  |
November 2016 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 26,561 |  |
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 1,915,000,000 |  |
August 2018 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchased During Period, Shares | 7,788 |  | 10,003 |  | 0 |  |
Stock Repurchased During Period, Value | $ 810,000,000 |  | $ 894,000,000 |  | $ 0 |  |
November 2019 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount | 2,000,000,000 |  |  |  |  |  | $ 2,000,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 2,000,000,000 |  |  |  |  |  | 2,000,000,000
August 2018 [Member] |  |  |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 296,000,000 |  |  |  |  |  | $ 296,000,000
[1] | 2019 amount excludes and 2018 amount 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 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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