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 (Details)

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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 (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Funded Status:      
Fair value of plan assets $ 45,482 $ 43,916  
United States      
Funded Status:      
Fair value of plan assets 43,589 42,273  
International Pension Benefits      
Funded Status:      
Fair value of plan assets 1,893 1,643  
Pension Benefits | United States      
Funded Status:      
Fair value of plan assets 43,491 42,058 $ 55,954
Benefit obligation (47,712) (43,504) (61,378)
Funded status (4,221) (1,446)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 1,408  
Other current liabilities (26) (24)  
Pension and postretirement benefit obligations (4,195) (2,830)  
Net asset (liability) (4,221) (1,446)  
Amounts Recognized in AOCI(1):      
Unrecognized net prior service cost (1,326) (734)  
Unrecognized net actuarial gain (loss) (2,097) 80  
Gross unrecognized cost (3,423) (654)  
Deferred tax assets (liabilities) 831 168  
Net unrecognized cost (2,592) (486)  
Pension Benefits | International Pension Benefits      
Funded Status:      
Fair value of plan assets 1,893 1,643 2,106
Benefit obligation (1,601) (1,416) (2,106)
Funded status 292 227  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 510 416  
Other current liabilities (7) (6)  
Pension and postretirement benefit obligations (211) (183)  
Net asset (liability) 292 227  
Amounts Recognized in AOCI(1):      
Unrecognized net prior service cost (7) (8)  
Unrecognized net actuarial gain (loss) 99 115  
Gross unrecognized cost 92 107  
Deferred tax assets (liabilities) (28) (30)  
Net unrecognized cost 64 77  
Postemployment Retirement Benefits | United States      
Funded Status:      
Fair value of plan assets 98 215 115
Benefit obligation (1,974) (2,016) $ (2,592)
Funded status (1,876) (1,801)  
Funded Status Recognized in our Balance Sheet:      
Other non-current assets 0 0  
Other current liabilities (123) (7)  
Pension and postretirement benefit obligations (1,753) (1,794)  
Net asset (liability) (1,876) (1,801)  
Amounts Recognized in AOCI(1):      
Unrecognized net prior service cost (2) (3)  
Unrecognized net actuarial gain (loss) 129 201  
Gross unrecognized cost 127 198  
Deferred tax assets (liabilities) (31) (48)  
Net unrecognized cost $ 96 $ 150