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Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3 $ 2 $ 7 $ 5
Interest cost 669 658 2,007 1,976
Expected return on plan assets (769) (827) (2,308) (2,483)
Amortization of prior service credits (18) (20) (55) (61)
Recognized net actuarial loss 76 66 229 200
Net periodic benefit income (39) (121) (120) (363)
Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 13 13 38 38
Interest cost 34 31 102 93
Expected return on plan assets (3) (2) (9) (8)
Amortization of prior service credits (1) (3) (1) (8)
Recognized net actuarial loss (35) (44) (106) (132)
Net periodic benefit income 8 (5) 24 (17)
Operating Income (Loss) | Pension        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes 3 2 7 5
Operating Income (Loss) | Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes 13 12 38 35
Other Income | Pension        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes (42) (123) (127) (368)
Other Income | Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes (5) (18) (14) (55)
Operating Income (Loss) Before Taxes | Pension        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes (39) (121) (120) (363)
Operating Income (Loss) Before Taxes | Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit (income)/cost included in Earnings/(loss) from operations, Other income, net and Earnings/(loss) before income taxes $ 8 $ (6) $ 24 $ (20)