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Shareholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value	$ 150	$ 255	$ 557	$ 530
Stock Repurchase Program, Remaining Authorized Repurchase Amount	393		393
May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value			557	0
Stock Repurchase Program, Authorized Amount	2,000		2,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	393		393
November 2019
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value				$ 530
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 0		$ 0
Issued Common Stock
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	2,000,000	2,000,000	4,635,000	4,746,000
Repurchase of shares of Common Stock, value	$ 15	$ 10	$ 37	$ 24
Issued Common Stock | May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased			4,635,000	0
Issued Common Stock | November 2019
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased			0	4,746,000

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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