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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, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | $ 43,448 |
Actual Return on Assets: |  |
Fair value of plan assets at end of year | 40,864 | $ 43,448
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 8 |
Actual Return on Assets: |  |
Fair value of plan assets at end of year | 6 | 8
Fair Value, Inputs, Level 3 | Corporate Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 8 | 0
Actual Return on Assets: |  |
Assets Held at End of Year | 0 | 0
Assets Sold During the Year | (7) | 0
Purchases | 11 | 9
Sales | (10) | (1)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 2 | 8
Fair Value, Inputs, Level 3 | Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 0 | 0
Actual Return on Assets: |  |
Assets Held at End of Year | 0 | 0
Assets Sold During the Year | 0 | 0
Purchases | 9 | 0
Sales | (5) | 0
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 4 | 0
Fair Value, Inputs, Level 3 | Structured Products |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 8 | 0
Actual Return on Assets: |  |
Assets Held at End of Year | 0 | 0
Assets Sold During the Year | (7) | 0
Purchases | 20 | 9
Sales | (15) | (1)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | $ 6 | $ 8

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 + Details
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