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Shareholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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. | $ 11 |  |  |  | $ 5
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date. | 100 |  |  |  | 100
Stock Repurchased During Period, Shares | 2,419 | [1] | 7,788 | [1] | 28,243
Stock Repurchased During Period, Value | $ 250 | [1] | $ 810 | [1] | $ 2,394
Defined Benefit Plan, Amortization of Gain (Loss) | 14 |  | 2 |  |
Amortization of prior service cost | 4 |  | 5 |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement | $ 4 |  | $ 3 |  |
November 2019 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 2,419 |  | 0 |  | 0
Stock Repurchased During Period, Value | $ 250 |  | $ 0 |  | $ 0
November 2017 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 0 |  | 18,240
Stock Repurchased During Period, Value | $ 0 |  | $ 0 |  | $ 1,500
August 2018 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchased During Period, Shares | 0 |  | 7,788 |  | 10,003
Stock Repurchased During Period, Value | $ 0 |  | $ 810 |  | $ 894
November 2019 [Member] |  |  |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | 2,000 |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 1,750 |  |  |  |
[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.

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