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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period $ (228) $ 550 $ (1,050)
Amortization of actuarial (gain) loss (247) (244) (599)
Prior service (credits) costs during period 48 29 96
Amortization of prior service (costs) credits 10 13 19
Other Benefits      
Net Periodic Benefit Cost      
Service cost 34 33 43
Interest cost 98 97 60
Expected return on plan assets 0 0 0
Amortization of prior service costs (credits) (25) (25) (27)
Recognized actuarial (gains) losses (15) (19) 13
Settlement losses (gains) 0 0 0
Curtailment losses (gains) (1) 0 0
Special termination benefits 0 0 0
Acquisition/Divestiture losses (gains) 0 0 0
Total net periodic benefit cost 91 86 89
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period (151) 108 (514)
Amortization of actuarial (gain) loss 15 19 (13)
Prior service (credits) costs during period 30 1 18
Amortization of prior service (costs) credits 25 25 27
Total changes recognized in other comprehensive income (81) 153 (482)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 10 239 (393)
U.S. | Pension Benefits      
Net Periodic Benefit Cost      
Service cost 357 342 432
Interest cost 465 448 318
Expected return on plan assets (597) (557) (624)
Amortization of prior service costs (credits) 4 4 2
Recognized actuarial (gains) losses 243 199 218
Settlement losses (gains) 0 56 363
Curtailment losses (gains) 0 0 0
Special termination benefits 0 0 0
Acquisition/Divestiture losses (gains) 0 0 0
Total net periodic benefit cost 472 492 709
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period (122) 270 (279)
Amortization of actuarial (gain) loss (243) (255) (581)
Prior service (credits) costs during period 0 0 40
Amortization of prior service (costs) credits (4) (4) (2)
Total changes recognized in other comprehensive income (369) 11 (822)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income 103 503 (113)
Int’l. | Pension Benefits      
Net Periodic Benefit Cost      
Service cost 54 58 83
Interest cost 191 193 137
Expected return on plan assets (196) (204) (176)
Amortization of prior service costs (credits) 11 8 6
Recognized actuarial (gains) losses 18 8 15
Settlement losses (gains) 1 0 (6)
Curtailment losses (gains) 0 2 (5)
Special termination benefits 0 2 0
Acquisition/Divestiture losses (gains) 0 (2) 0
Total net periodic benefit cost 79 65 54
Changes Recognized in Comprehensive Income      
Net actuarial (gain) loss during period 45 172 (257)
Amortization of actuarial (gain) loss (19) (8) (5)
Prior service (credits) costs during period 18 28 38
Amortization of prior service (costs) credits (11) (8) (6)
Total changes recognized in other comprehensive income 33 184 (230)
Recognized in Net Periodic Benefit Cost and Other Comprehensive Income $ 112 $ 249 $ (176)