Valuation and Qualifying Accounts (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Valuation and Qualifying Accounts Disclosure [Line Items]
Charged to/from Other Accounts	$ 3	$ (18)	$ 10
Allowance for trade receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance January 1,	47	40	29
Charged to/reversed from Expenses	5	11	7
Charged to/from Other Accounts	(2)	2	7
Payments/ Other		(6)	(3)
Balance December 31,	50	47	40
Allowance for notes receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance January 1,	132	159	175
Charged to/reversed from Expenses	24	20	26
Payments/ Other	(32)	(47)	(42)
Balance December 31,	124	132	159
Restructuring and other special charges [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance January 1,	20	78	89
Charged to/reversed from Expenses	(1)	1	(12)
Charged to/from Other Accounts	5	(20)	3
Payments/ Other	(9)	(39)	(2)
Balance December 31,	$ 15	$ 20	$ 78

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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