Subsequent Events (Details) - USD ($) $ in Millions		12 Months Ended
	Feb. 03, 2021	Dec. 31, 2020	Feb. 04, 2021	Jan. 31, 2021	Dec. 31, 2015
Subsequent Event [Line Items]
Share repurchase program, authorized amount					$ 1,200
Stock repurchase program, remaining authorized repurchase amount		$ 600
Restricted stock units | Performance Shares
Subsequent Event [Line Items]
Performance share, actual yielded performance, percent		50.00%
Subsequent Event
Subsequent Event [Line Items]
Stock repurchase program, additional authorized amount			$ 300
Stock repurchase program, remaining authorized repurchase amount				$ 568
Subsequent Event | Restricted stock units | Performance Shares
Subsequent Event [Line Items]
Performance share, actual yielded performance, percent	95.00%