Shareholders' Equity (Details) $ / shares in Units, $ in Millions	1 Months Ended		12 Months Ended
	Apr. 30, 2019 $ / shares	Apr. 30, 2017 $ / shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 23, 2019 shares
Class of Stock
Number of shares of common stock authorized			1,100,000,000
Number of shares of preferred stock authorized			15,000,000
Stock split ratio		2
Percentage increase in quarterly dividends	50.00%	54.00%
Dividends declared (in dollars per share) | $ / shares	$ 0.15	$ 0.10
Stock Repurchase Program [Abstract]
Share repurchases, net of issuances | $			$ 945	$ 711	$ 76
Maximum
Stock Repurchase Program [Abstract]
Number of shares authorized for repurchase						50,000,000
Series A Junior Participating Preferred Stock
Class of Stock
Number of shares of preferred stock authorized			550,000