Net Income Per Share (Narrative) (Details) - Common stock repurchase program - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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)	50,000,000	200,000,000	160,000,000	400,000,000
Stock Repurchased During Period, Shares	592,136	1,337,310	1,511,930	2,773,843