Employee Benefit Plans and Postretirement Benefits - Projected Benefit Obligations in Excess of Plan Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 3,211	$ 2,149
Fair value of plan assets	2,404	1,191
Healthcare [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,157	1,243
Fair value of plan assets	105	107
Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 423	$ 526

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

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