Subsequent Events (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 22, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 18, 2019
Subsequent Event [Line Items]
Payment to repurchase shares of common stock		$ 0	$ 1,763	$ 1,453
Number of shares authorized to be repurchased					100,000,000
Subsequent Event
Subsequent Event [Line Items]
Payment to repurchase shares of common stock	$ 180