Shareholders' Deficit (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value	$ 157	$ 330	$ 714	$ 860
Stock Repurchase Program, Remaining Authorized Repurchase Amount	2,236		2,236
Number of shares repurchased with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date				100,000
Value of share repurchases with trade dates during the current reporting date but with settlement dates subsequent to the current reporting date				$ 14
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				100,000
May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value			714	$ 330
Stock Repurchase Program, Authorized Amount	2,000		2,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	236		236
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
September 2022
Repurchase Of Shares Of Common Stock [Line Items]
Repurchase of shares of Common Stock, value				$ 0
Stock Repurchase Program, Authorized Amount	2,000		2,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 2,000		$ 2,000
Issued Common Stock
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased	1,000,000	2,000,000	5,987,000	7,348,000
Repurchase of shares of Common Stock, value	$ 18	$ 0	$ 55	$ 24
Issued Common Stock | May 2021
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased			5,987,000	2,602,000
Issued Common Stock | November 2019
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased			0	4,746,000
Issued Common Stock | September 2022
Repurchase Of Shares Of Common Stock [Line Items]
Shares Repurchased			0	0