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Postretirement Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension              
Defined Benefit Plan Disclosure [Line Items]              
Service cost $ 1 $ 1 $ 3 $ 2 $ 2 $ 3 $ 3
Interest cost 659 705 1,318 1,410 2,820 2,080 1,988
Expected return on plan assets (827) (859) (1,656) (1,720) (3,441) (3,789) (3,848)
Amortization of prior service credits (21) (21) (41) (41) (81) (81) (80)
Recognized net actuarial loss 67 41 134 83 173 913 1,219
Settlement/curtailment (gain)/loss           (4) 193
Net periodic benefit income (121) (133) (242) (266) (527) (878) (525)
Postretirement              
Defined Benefit Plan Disclosure [Line Items]              
Service cost 13 12 25 24 49 72 87
Interest cost 31 37 62 74 148 98 97
Expected return on plan assets (4) (2) (6) (4) (9) (10) (7)
Amortization of prior service credits (2) (5) (5) (11) (22) (35) (35)
Recognized net actuarial loss (44) (44) (88) (88) (175) (111) (56)
Net periodic benefit income (6) (2) (12) (5) (9) 14 86
Operating Income (Loss) | Pension              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes 1 1 3 2 2 3 3
Operating Income (Loss) | Postretirement              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes 12 16 23 31 62 79 90
Other Income | Pension              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes (122) (134) (245) (268) (529) (881) (528)
Other Income | Postretirement              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes (19) (14) (37) (29) (58) (58) (1)
Operating Income (Loss) Before Taxes | Pension              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes (121) (133) (242) (266) (527) (878) (525)
Operating Income (Loss) Before Taxes | Postretirement              
Defined Benefit Plan Disclosure [Line Items]              
Net periodic benefit (income)/cost included in (loss)/earnings from operations, other income, and loss before income taxes $ (7) $ 2 $ (14) $ 2 $ 4 $ 21 $ 89