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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | $ 30,129 |
Actual Return on Assets: |  |
Fair value of plan assets at end of year | 30,031 | $ 30,129
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 7,977 | 7,260
Actual Return on Assets: |  |
Assets Held at End of Year | 39 | 245
Assets Sold During the Year | 231 | 140
Purchases | 1,327 | 2,402
Sales | (1,306) | (2,070)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 8,268 | 7,977
Fair Value, Inputs, Level 3 | Corporate Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 269 | 223
Actual Return on Assets: |  |
Assets Held at End of Year | (8) | 0
Assets Sold During the Year | 0 | 0
Purchases | 22 | 108
Sales | (4) | (62)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 279 | 269
Fair Value, Inputs, Level 3 | Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 3,595 | 3,738
Actual Return on Assets: |  |
Assets Held at End of Year | 62 | 71
Assets Sold During the Year | 39 | (9)
Purchases | 283 | 1,043
Sales | (362) | (1,248)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 3,617 | 3,595
Fair Value, Inputs, Level 3 | Structured Products(1) |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 1,307 | 1,091
Actual Return on Assets: |  |
Assets Held at End of Year | 79 | 104
Assets Sold During the Year | 45 | 23
Purchases | 545 | 350
Sales | (409) | (261)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 1,567 | 1,307
Fair Value, Inputs, Level 3 | Private Equity |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 1,323 | 1,397
Actual Return on Assets: |  |
Assets Held at End of Year | (39) | 11
Assets Sold During the Year | 149 | 126
Purchases | 347 | 166
Sales | (365) | (377)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 1,415 | 1,323
Fair Value, Inputs, Level 3 | All Other Corporate Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 613 | 0
Actual Return on Assets: |  |
Assets Held at End of Year | 11 | 0
Assets Sold During the Year | (2) | 0
Purchases | 130 | 735
Sales | (166) | (122)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 586 | 613
Fair Value, Inputs, Level 3 | Risk Parity Funds [Domain] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 817 | 756
Actual Return on Assets: |  |
Assets Held at End of Year | (62) | 61
Assets Sold During the Year | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 755 | 817
Fair Value, Inputs, Level 3 | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 53 | 55
Actual Return on Assets: |  |
Assets Held at End of Year | (4) | (2)
Assets Sold During the Year | 0 | 0
Purchases | 0 | 0
Sales | 0 | 0
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | $ 49 | $ 53

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- Definition Actual return on plan assets, separately identifying the amount related to assets sold during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 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) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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