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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension and Other Postretirement Benefits | $ 685 | $ 186 | $ 7,794 | $ 2,668
Funded Status: |  |  |  |
Fair value of plan assets |  | 40,864 | 43,448 |
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension and Other Postretirement Benefits |  | 23 | 22 |
Pension Benefits | U.S. Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 31,215 | 39,554 | 41,932 | 31,215
Benefit obligation | (41,069) | (45,333) | (45,847) | (41,069)
Funded status recognized at December 31 |  | (5,779) | (3,915) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets |  | 0 | 284 |
Other current liabilities |  | (20) | (18) |
Pension and postretirement benefit obligations |  | (5,759) | (4,181) |
Net liability at December 31 |  | (5,779) | (3,915) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost |  | (1,018) | (880) |
Unrecognized net actuarial gain (loss) |  | (3,967) | (4,277) |
Gross unrecognized cost at December 31 |  | (4,985) | (5,157) |
Deferred tax assets (liabilities) at December 31 |  | 1,205 | 1,840 |
Net unrecognized cost at December 31 |  | (3,780) | (3,317) |
Pension Benefits | International Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 1,092 | 1,284 | 1,333 | 1,092
Benefit obligation | (1,425) | (1,552) | (1,651) | (1,425)
Funded status recognized at December 31 |  | (268) | (318) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets |  | 35 | 35 |
Other current liabilities |  | (4) | (5) |
Pension and postretirement benefit obligations |  | (299) | (348) |
Net liability at December 31 |  | (268) | (318) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost |  | (14) | (2) |
Unrecognized net actuarial gain (loss) |  | (100) | (126) |
Gross unrecognized cost at December 31 |  | (114) | (128) |
Deferred tax assets (liabilities) at December 31 |  | 28 | 31 |
Net unrecognized cost at December 31 |  | (86) | (97) |
Postemployment Retirement Benefits | U.S. Pension Benefits |  |  |  |
Funded Status: |  |  |  |
Fair value of plan assets | 15 | 26 | 183 | 15
Benefit obligation | $ (2,730) | (2,510) | (2,792) | $ (2,730)
Funded status recognized at December 31 |  | (2,484) | (2,609) |
Funded Status Recognized in our Balance Sheet: |  |  |  |
Other non-current assets |  | 0 | 0 |
Other current liabilities |  | (195) | (77) |
Pension and postretirement benefit obligations |  | (2,289) | (2,532) |
Net liability at December 31 |  | (2,484) | (2,609) |
Amounts Recognized in AOCI: |  |  |  |
Unrecognized net prior service cost |  | (21) | (29) |
Unrecognized net actuarial gain (loss) |  | (32) | (195) |
Gross unrecognized cost at December 31 |  | (53) | (224) |
Deferred tax assets (liabilities) at December 31 |  | 13 | 69 |
Net unrecognized cost at December 31 |  | $ (40) | $ (155) |

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