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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension and Other Postretirement Benefits | $ 685 | $ 7,794 | $ 2,668 | $ 1,229
Funded Status: |  |  |  |
Fair value of plan assets | 0 | 8 | 0 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension and Other Postretirement Benefits |  |  | 22 |
Pension Benefits | U.S. Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 31,215 | 41,932 | 31,215 | 28,887
Benefit obligation | (41,069) | (45,847) | (41,069) | (36,846)
Funded status recognized at December 31 | (9,854) | (3,915) | (9,854) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets | 0 | 284 | 0 |
Other current liabilities | (17) | (18) | (17) |
Pension and postretirement benefit obligations | (9,837) | (4,181) | (9,837) |
Net liability at December 31 | (9,854) | (3,915) | (9,854) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost | (1,074) | (880) | (1,074) |
Unrecognized net actuarial gain (loss) | (4,107) | (4,277) | (4,107) |
Gross unrecognized cost at December 31 | (5,181) | (5,157) | (5,181) |
Deferred tax assets (liabilities) at December 31 | 1,948 | 1,840 | 1,948 |
Net unrecognized cost at December 31 | (3,233) | (3,317) | (3,233) |
Pension Benefits | International Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 1,092 | 1,333 | 1,092 | 1,014
Benefit obligation | (1,425) | (1,651) | (1,425) | (1,219)
Funded status recognized at December 31 | (333) | (318) | (333) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets | 28 | 35 | 28 |
Other current liabilities | (3) | (5) | (3) |
Pension and postretirement benefit obligations | (358) | (348) | (358) |
Net liability at December 31 | (333) | (318) | (333) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost | (3) | (2) | (3) |
Unrecognized net actuarial gain (loss) | (150) | (126) | (150) |
Gross unrecognized cost at December 31 | (153) | (128) | (153) |
Deferred tax assets (liabilities) at December 31 | 37 | 31 | 37 |
Net unrecognized cost at December 31 | (116) | (97) | (116) |
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 15 | 183 | 15 | 130
Benefit obligation | (2,730) | (2,792) | (2,730) | $ (2,673)
Funded status recognized at December 31 | (2,715) | (2,609) | (2,715) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets | 0 | 0 | 0 |
Other current liabilities | (216) | (77) | (216) |
Pension and postretirement benefit obligations | (2,499) | (2,532) | (2,499) |
Net liability at December 31 | (2,715) | (2,609) | (2,715) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost | (36) | (29) | (36) |
Unrecognized net actuarial gain (loss) | (80) | (195) | (80) |
Gross unrecognized cost at December 31 | (116) | (224) | (116) |
Deferred tax assets (liabilities) at December 31 | 44 | 69 | 44 |
Net unrecognized cost at December 31 | $ (72) | $ (155) | $ (72) |

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