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
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Funded Status:      
Fair value of plan assets $ 58,175 $ 54,881  
United States      
Funded Status:      
Fair value of plan assets 56,069 53,046  
International Pension Benefits      
Funded Status:      
Fair value of plan assets 2,106 1,835  
Pension Benefits | United States      
Funded Status:      
Fair value of plan assets 55,954 52,997 $ 46,172
Benefit obligation (61,378) (65,922) (54,039)
Funded status (5,424) (12,925)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (24) (22)  
Pension and postretirement benefit obligations (5,400) (12,903)  
Net liability (5,424) (12,925)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (682) (753)  
Unrecognized net actuarial gain (loss) (1,949) (6,592)  
Gross unrecognized cost (2,631) (7,345)  
Deferred tax assets (liabilities) 642 1,770  
Net unrecognized cost (1,989) (5,575)  
Pension Benefits | International Pension Benefits      
Funded Status:      
Fair value of plan assets 2,106 1,835 1,558
Benefit obligation (2,106) (2,177) (1,906)
Funded status 0 (342)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 295 51  
Other current liabilities (7) (5)  
Pension and postretirement benefit obligations (288) (388)  
Net liability 0 (342)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (9) (11)  
Unrecognized net actuarial gain (loss) 107 (151)  
Gross unrecognized cost 98 (162)  
Deferred tax assets (liabilities) (27) 38  
Net unrecognized cost 71 (124)  
Postemployment Retirement Benefits | United States      
Funded Status:      
Fair value of plan assets 115 49 37
Benefit obligation (2,592) (2,759) $ (2,616)
Funded status (2,477) (2,710)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (118) (184)  
Pension and postretirement benefit obligations (2,359) (2,526)  
Net liability (2,477) (2,710)  
Amounts Recognized in AOCI:      
Unrecognized net prior service cost (3) (9)  
Unrecognized net actuarial gain (loss) (232) (276)  
Gross unrecognized cost (235) (285)  
Deferred tax assets (liabilities) 55 69  
Net unrecognized cost $ (180) $ (216)