Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Funded Status as of the Respective Measurement Dates in Each Year and the Amounts Recognized in Balance Sheet (Detail)

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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits $ 3,125 $ 2,362 $ 186
Funded Status:      
Fair value of plan assets 54,881 47,767  
United States      
Funded Status:      
Fair value of plan assets 53,046 46,209  
International Pension Benefits      
Funded Status:      
Fair value of plan assets 1,835 1,558  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Payment for Pension and Other Postretirement Benefits 26 27  
Pension Benefits | United States      
Funded Status:      
Fair value of plan assets 52,997 46,172 39,554
Benefit obligation (65,922) (54,039) (45,333)
Funded status (12,925) (7,867)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (22) (22)  
Pension and postretirement benefit obligations (12,903) (7,845)  
Net liability (12,925) (7,867)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (753) (800)  
Unrecognized net actuarial gain (loss) (6,592) (5,404)  
Gross unrecognized cost (7,345) (6,204)  
Deferred tax assets (liabilities) 1,770 1,497  
Net unrecognized cost (5,575) (4,707)  
Pension Benefits | International Pension Benefits      
Funded Status:      
Fair value of plan assets 1,835 1,558 1,284
Benefit obligation (2,177) (1,906) (1,552)
Funded status (342) (348)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 51 34  
Other current liabilities (5) (5)  
Pension and postretirement benefit obligations (388) (377)  
Net liability (342) (348)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (11) (12)  
Unrecognized net actuarial gain (loss) (151) (162)  
Gross unrecognized cost (162) (174)  
Deferred tax assets (liabilities) 38 40  
Net unrecognized cost (124) (134)  
Postemployment Retirement Benefits | United States      
Funded Status:      
Fair value of plan assets 49 37 26
Benefit obligation (2,759) (2,616) $ (2,510)
Funded status (2,710) (2,579)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (184) (200)  
Pension and postretirement benefit obligations (2,526) (2,379)  
Net liability (2,710) (2,579)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (9) (16)  
Unrecognized net actuarial gain (loss) (276) (240)  
Gross unrecognized cost (285) (256)  
Deferred tax assets (liabilities) 69 62  
Net unrecognized cost $ (216) $ (194)