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Pensions and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Non-service cost components of net periodic pension and OPEB income $ 86 $ 376 $ 172 $ 752
Global OPEB Plans        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 2 4 4 8
Interest cost 59 37 118 74
Expected return on plan assets 0 0 0 0
Amortization of prior service cost (credit) (1) (2) (1) (3)
Amortization of net actuarial (gains) losses (5) 17 (11) 34
Net periodic pension and OPEB (income) expense 55 56 110 113
U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 43 58 87 116
Interest cost 568 323 1,136 646
Expected return on plan assets (730) (750) (1,460) (1,500)
Amortization of prior service cost (credit) 0 0 (1) (1)
Amortization of net actuarial (gains) losses 0 4 0 9
Net periodic pension and OPEB (income) expense (119) (365) (238) (730)
Non-U.S. | Pension Plan        
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]        
Service cost 42 33 84 68
Interest cost 176 74 337 150
Expected return on plan assets (184) (135) (352) (274)
Amortization of prior service cost (credit) 0 1 1 2
Amortization of net actuarial (gains) losses 9 34 17 69
Net periodic pension and OPEB (income) expense $ 43 $ 7 $ 87 $ 15