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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, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | $ 40,864 |
Actual Return on Assets: |  |
Fair value of plan assets at end of year | 47,767 | $ 40,864
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 6 |
Actual Return on Assets: |  |
Fair value of plan assets at end of year | 12 | 6
Fair Value, Inputs, Level 3 | Corporate Bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 2 | 8
Actual Return on Assets: |  |
Assets Held at End of Year | 0 | 0
Assets Sold During the Year | (4) | (7)
Purchases | 4 | 11
Sales | (2) | (10)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 0 | 2
Fair Value, Inputs, Level 3 | Hedge Funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 4 | 0
Actual Return on Assets: |  |
Assets Held at End of Year | 1 | 0
Assets Sold During the Year | 0 | 0
Purchases | 7 | 9
Sales |  | (5)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | 12 | 4
Fair Value, Inputs, Level 3 | Structured Products |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets at beginning of year | 6 | 8
Actual Return on Assets: |  |
Assets Held at End of Year | 1 | 0
Assets Sold During the Year | (4) | (7)
Purchases | 11 | 20
Sales | (2) | (15)
Transfers Into (Out of) Level 3 | 0 | 0
Fair value of plan assets at end of year | $ 12 | $ 6

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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=118255775&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=118257860&loc=d3e4179-114921 + Details
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