Equity - Statements of Equity with dividends per share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balance	$ 2,741
Net income	78	$ 102
Balance	$ 2,627
Dividends declared, common stock (in dollars per share)	$ 0.63	$ 0.625
Common Stock
Balance	$ 1	$ 1
Balance	1	1
Additional Paid-in Capital
Balance	1,137	1,096
Repurchases of common stock, net		32
Share-based compensation, net of issuance	5	9
Balance	1,142	1,137
Treasury Stock
Balance	(1,040)	(1,091)
Repurchases of common stock, net		31
Share-based compensation, net of issuance	12	10
Balance	(1,028)	(1,050)
Accumulated Other Comprehensive Loss
Balance	(1,158)	(1,154)
Other comprehensive income (loss)	(164)	(6)
Balance	(1,322)	(1,160)
Retained Earnings
Balance	3,780	3,536
Net income	75	100
Dividends declared, common stock	(42)	(42)
Balance	3,813	3,594
Non-Controlling Interests
Balance	21	20
Net income	3	2
Other comprehensive income (loss)	(3)
Balance	$ 21	$ 22