Financial Instruments (Fair Values Of Derivatives Instruments) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	$ 7		$ 7
Fair Value, Liability Derivatives	22		19
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	3	[1]	2	[1]
Fair Value, Liability Derivatives	0	[1]	1	[1]
Not Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	0		0
Fair Value, Liability Derivatives	0		0
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contract [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	3	[2]	3	[2]
Fair Value, Liability Derivatives	13	[2]	5	[2]
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	1	[3]	2	[3]
Fair Value, Liability Derivatives	9	[3]	13	[3]
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Schedule of Cost-method Investments [Line Items]
Fair Value, Asset Derivatives	0		0
Fair Value, Liability Derivatives	$ 0		$ 0

[1] Included in other non-current assets or other non-current liabilities.

[2] Included in other current assets or other current liabilities.

[3] Included in assets under vehicle programs or liabilities under vehicle programs.