Equity - Summary of Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Dividends declared per share (usd per share)		$ 0.26	$ 0.24	$ 0.24		$ 0.24
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 2,967		$ 2,782		$ 2,782
Cumulative effect of adoption							$ (2)
Sale of business			(2)
Net income	38		79
Other comprehensive income (loss), net	(87)		20
Dividends declared	(48)		(44)
Stock incentive plan activity	3		(2)
Repurchase of common stock	(50)		(25)
Ending balance	2,821		2,808		2,967	$ 2,782
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2		2		2
Ending balance	2		2		2	2
Capital in Excess of Par Value
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,991		1,950		1,950
Stock incentive plan activity	13		12
Ending balance	2,004		1,962		1,991	1,950
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,866		1,639		1,639
Cumulative effect of adoption							$ (2)
Sale of business			0
Net income	38		79
Dividends declared	(48)		(44)
Ending balance	1,854		1,674		1,866	1,639
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(375)		(336)		(336)
Sale of business			0
Other comprehensive income (loss), net	(86)		20
Ending balance	(461)		(316)		(375)	(336)
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(527)		(487)		(487)
Stock incentive plan activity	(10)		(14)
Repurchase of common stock	(50)		(25)
Ending balance	(587)		(526)		(527)	(487)
Non-Controlling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	10		14		14
Sale of business	(2)
Other comprehensive income (loss), net	(1)
Ending balance	$ 9		$ 12		$ 10	$ 14