Net Income Per Share (Narrative) (Details) - Common stock repurchase program - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 13, 2018
Equity, Class of Treasury Stock [Line Items]
Authorized amount					$ 2,000,000,000
Remaining authorized amount	$ 1,100,000,000		$ 1,100,000,000
Purchases of treasury stock (shares)	0	200,000,000	160,000,000	600,000,000
Stock Repurchased During Period, Shares	0	1,594,447	1,511,930	4,368,290