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Postretirement Plans - Schedule of Changes in the Benefit Obligation, Plan Assets and Funded Status of Pensions and OPB (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2020
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]                
Company contribution $ 3,000              
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]                
Accrued pension plan liability, net   $ (6,248)   $ (6,248)   $ (6,516) $ (6,141)  
Pension                
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]                
Beginning balance       54,325 $ 55,117 55,117 75,635  
Service cost   1 $ 1 3 2 2 3 $ 3
Interest cost   659 705 1,318 1,410 2,820 2,080 1,988
Amendments             1  
Actuarial loss/(gain)           1,217 (17,605)  
Gross benefits paid           (4,837) (4,971)  
Exchange rate adjustment           6 (26)  
Ending balance           54,325 55,117 75,635
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]                
Beginning balance at fair value       48,891 49,825 49,825 67,813  
Actual return on plan assets           3,756 (13,141)  
Company contribution             2  
Benefits paid           (4,698) (4,824)  
Exchange rate adjustment           8 (25)  
Ending balance at fair value           48,891 49,825 67,813
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]                
Other assets           1,219 987  
Accrued liabilities           (137) (138)  
Accrued pension plan liability, net           (6,516) (6,141)  
Net amount recognized           (5,434) (5,292)  
Other Postretirement Benefits                
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]                
Beginning balance       2,651 2,978 2,978 4,092  
Service cost   13 12 25 24 49 72 87
Interest cost   $ 31 $ 37 62 74 148 98 97
Actuarial loss/(gain)           (152) (914)  
Gross benefits paid           (375) (406)  
Subsidies           2 39  
Exchange rate adjustment           1 (3)  
Ending balance           2,651 2,978 4,092
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]                
Beginning balance at fair value       $ 163 $ 140 140 172  
Actual return on plan assets           23 (27)  
Plan participants' contributions           4 6  
Benefits paid           (4) (11)  
Ending balance at fair value           163 140 $ 172
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]                
Other assets           81 21  
Accrued liabilities           (336) (356)  
Accrued retiree health care           (2,233) (2,503)  
Net amount recognized           $ (2,488) $ (2,838)