Consolidating Guarantor Financial Information (Schedule of Consolidating Statement of Cash Flows) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 570	$ 441	$ 463	$ 439
Net cash provided by (used in) operating activities	259	307
Investing Activities
Capital expenditures on property, plant and equipment	(119)	(79)
Acquisitions, net of cash acquired	0	(91)
Return of capital from subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(9)	(7)
Net cash provided by (used in) investing activities	(128)	(177)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(39)	197
Proceeds from short-term borrowings	300	0
Repayments of short-term borrowings	0	(12)
Repayments of long-term debt	(9)	(7)
Purchases of treasury stock, including related fees	(167)	(212)
Dividends to parent		0
Common stock dividends	(74)	(70)
Return of capital to parent	0	0
Distributions to noncontrolling interests	(5)	(4)
Other, net	(22)	(22)
Net cash provided by (used in) financing activities	(16)	(130)
Exchange rate effects on cash and cash equivalents	(8)	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	107	2
Parent Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	0	0
Net cash provided by (used in) operating activities	241	282
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired		0
Return of capital from subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	0	0
Net cash provided by (used in) investing activities	0	0
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	0
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings		0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	(167)	(212)
Dividends to parent		0
Common stock dividends	(74)	(70)
Return of capital to parent	0	0
Distributions to noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(241)	(282)
Exchange rate effects on cash and cash equivalents	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	20	0	0	0
Net cash provided by (used in) operating activities	(280)	26
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired		0
Return of capital from subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	0	0
Net cash provided by (used in) investing activities	0	0
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	246
Proceeds from short-term borrowings	300	0
Repayments of short-term borrowings		0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent		(272)
Common stock dividends	0	0
Return of capital to parent	0	0
Distributions to noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	300	(26)
Exchange rate effects on cash and cash equivalents	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	20	0
Subsidiary Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	21	69	16	30
Net cash provided by (used in) operating activities	129	1,032
Investing Activities
Capital expenditures on property, plant and equipment	(69)	(42)
Acquisitions, net of cash acquired		(31)
Return of capital from subsidiary	5	4
Intercompany loan receipts (disbursements)	(19)	(646)
Other, net	0	2
Net cash provided by (used in) investing activities	(83)	(713)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(20)	(9)
Proceeds from short-term borrowings	0	0
Repayments of short-term borrowings		0
Repayments of long-term debt	(1)	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent		(251)
Common stock dividends	0	0
Return of capital to parent	0	0
Distributions to noncontrolling interests	0	0
Other, net	(20)	(20)
Net cash provided by (used in) financing activities	(41)	(280)
Exchange rate effects on cash and cash equivalents	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	5	39
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	529	372	447	409
Net cash provided by (used in) operating activities	169	528
Investing Activities
Capital expenditures on property, plant and equipment	(50)	(37)
Acquisitions, net of cash acquired		(60)
Return of capital from subsidiary	0	0
Intercompany loan receipts (disbursements)	0	0
Other, net	(9)	(9)
Net cash provided by (used in) investing activities	(59)	(106)
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	0	(4)
Proceeds from short-term borrowings	0	610
Repayments of short-term borrowings		(12)
Repayments of long-term debt	(8)	(7)
Purchases of treasury stock, including related fees	0	0
Dividends to parent		(1,038)
Common stock dividends	0	0
Return of capital to parent	(5)	(4)
Distributions to noncontrolling interests	(5)	(4)
Other, net	(2)	(2)
Net cash provided by (used in) financing activities	(20)	(461)
Exchange rate effects on cash and cash equivalents	(8)	2
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	82	(37)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	0	0	$ 0	$ 0
Net cash provided by (used in) operating activities	0	(1,561)
Investing Activities
Capital expenditures on property, plant and equipment	0	0
Acquisitions, net of cash acquired		0
Return of capital from subsidiary	(5)	(4)
Intercompany loan receipts (disbursements)	19	646
Other, net	0	0
Net cash provided by (used in) investing activities	14	642
Financing Activities
Net change in short-term borrowings with maturities of 3 months or less	(19)	(36)
Proceeds from short-term borrowings	0	(610)
Repayments of short-term borrowings		0
Repayments of long-term debt	0	0
Purchases of treasury stock, including related fees	0	0
Dividends to parent		1,561
Common stock dividends	0	0
Return of capital to parent	5	4
Distributions to noncontrolling interests	0	0
Other, net	0	0
Net cash provided by (used in) financing activities	(14)	919
Exchange rate effects on cash and cash equivalents	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	$ 0	$ 0