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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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