v3.25.2
Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3 $ 1 $ 4 $ 3
Interest cost 669 659 1,338 1,318
Expected return on plan assets (770) (827) (1,539) (1,656)
Amortization of prior service credits (18) (21) (37) (41)
Recognized net actuarial loss 77 67 153 134
Net periodic benefit income (39) (121) (81) (242)
Postretirement        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 12 13 25 25
Interest cost 34 31 68 62
Expected return on plan assets (3) (4) (6) (6)
Amortization of prior service credits (2) (5)
Recognized net actuarial loss (35) (44) (71) (88)
Net periodic benefit income 8 (6) 16 (12)
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 1 4 3
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 12 12 25 23
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) (122) (85) (245)
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 (4) (19) (9) (37)
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) (81) (242)
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 $ (7) $ 16 $ (14)