Schedule of Changes in Level 3 Plan Assets (Detail) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	$ 2,207	$ 2,109
Net Realized and Unrealized Gains/ (Losses)	52	187
Net Purchases, Issuances and Settlements	(312)	(50)
Net Transfers Into/(Out of) Level 3	(4)	99
Currency Impact	(104)	(138)
Fair value of plan assets at December 31	1,839	2,207
Pooled Funds - Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	97	15
Net Realized and Unrealized Gains/ (Losses)	(1)	(15)
Net Purchases, Issuances and Settlements	25	15
Net Transfers Into/(Out of) Level 3	(3)	87
Currency Impact	(6)	(5)
Fair value of plan assets at December 31	112	97
Corporate Bonds And Other Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	749	780
Net Realized and Unrealized Gains/ (Losses)	4	80
Net Purchases, Issuances and Settlements	(50)	(64)
Currency Impact	(38)	(47)
Fair value of plan assets at December 31	665	749
Real Estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	292	267
Net Realized and Unrealized Gains/ (Losses)	19	37
Net Purchases, Issuances and Settlements	61	(2)
Net Transfers Into/(Out of) Level 3		10
Currency Impact	(17)	(20)
Fair value of plan assets at December 31	355	292
Hedge Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	829	820
Net Realized and Unrealized Gains/ (Losses)	13	40
Net Purchases, Issuances and Settlements	(312)	20
Currency Impact	(31)	(51)
Fair value of plan assets at December 31	499	829
Private Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at January 1	240	227
Net Realized and Unrealized Gains/ (Losses)	17	45
Net Purchases, Issuances and Settlements	(36)	(19)
Net Transfers Into/(Out of) Level 3	(1)	2
Currency Impact	(12)	(15)
Fair value of plan assets at December 31	$ 208	$ 240

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)
-URI http://asc.fasb.org/extlink&oid=6504192

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6504226

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 35
-Paragraph 50
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