Derivative Financial Instruments (Fair Value of Derivatives) (Detail) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivative Liability		$ 19	$ 11
Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	2	1
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	17	10
Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		2	1
Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		17	10
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability		12	8
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	1	1
Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	11	7
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		1	1
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		11	7
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Liability		7	3
Not Designated as Hedging Instrument [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[1]	1	0
Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability	[2]	6	3
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Current Liabilities [Member]
Derivative [Line Items]
Derivative Liability		1	0
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative Liability		$ 6	$ 3

[1] Current derivative liabilities are presented in other current liabilities in the Consolidated Balance Sheets.

[2] Noncurrent derivative liabilities are presented in other deferred credits and other liabilities in the Consolidated Balance Sheets.