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Shareholders' Deficit (Details) - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Repurchase Of Shares Of Common Stock [Line Items] |  |  |
Repurchase of shares of Common Stock, value | $ 275 | [1] | $ 0
Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1,475 |  |
Value of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter | $ 11 |  |
Number of shares repurchased with trade dates prior to the current reporting quarter, but settlement dates in the current quarter | 100 |  |
Issued Common Stock |  |  |
Repurchase Of Shares Of Common Stock [Line Items] |  |  |
Shares Repurchased | 2,599 | [1] | 0
Repurchase of shares of Common Stock, value | $ 14 |  |
[1] | (a) Excludes the effect of $11 million in share repurchases (0.1 million shares) with trade dates on, or prior to, December 31, 2020, but cash settlement dates subsequent to December 31, 2020.

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