Equity - Equity Repurchase Program (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 28, 2021	Apr. 01, 2021
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount	$ 3,000
Treasury Stock, Value, Acquired, Cost Method	$ 1,700	$ 150	$ 200
Treasury Stock, Shares, Acquired	25,900,000	2,700,000	3,400,000
1/1/2020-12/31/2022 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount		$ 1,500
Stock Repurchase Program, Increase Authorized Amount				$ 500	$ 1,000
2/4/2019-12/31/2020 [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount		$ 1,000