Common Stock (Details) - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Nov. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)		1,000,000.0
Payments for repurchase of common stock	$ 0	$ 100,000,000
Stock-based compensation, shares issued during period (in shares)	2,800,000	3,800,000
Common Stock
Equity, Class of Treasury Stock [Line Items]
Common stock repurchased (in shares)	0
Share repurchases program, authorized amount (up to)			$ 2,500,000,000
Stock repurchase program, remaining authorized repurchase amount	$ 2,400,000,000