Equity - Summary of Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Dividends declared per share (usd per share)	$ 0.28	$ 0.26
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,976	$ 2,967
Other	1
Net income	87	38
Other comprehensive income (loss), net	(13)	(87)
Dividends declared	(50)	(48)
Stock incentive plan activity	5	3
Repurchase of common stock	(60)	(50)
Ending balance	2,946	2,821
Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(2)
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2	2
Ending balance	2	2
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,037	1,991
Stock incentive plan activity	12	13
Ending balance	2,049	2,004
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,930	1,866
Net income	87	38
Dividends declared	(50)	(48)
Ending balance	1,967	1,854
Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance		(2)
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(413)	(375)
Other comprehensive income (loss), net	(13)	(86)
Ending balance	(426)	(461)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(588)	(527)
Stock incentive plan activity	(7)	(10)
Repurchase of common stock	(60)	(50)
Ending balance	(655)	(587)
Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	8	10
Other	1
Other comprehensive income (loss), net	0	(1)
Ending balance	$ 9	$ 9