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Retirement Plans and Other Retiree Benefits - Summary of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components of Net Periodic Benefit Cost          
ERISA litigation matter $ 267   $ 0 $ 267 $ 0
Other Retiree Benefit Plans          
Components of Net Periodic Benefit Cost          
Service cost     7 7 18
Interest cost     36 38 36
Expected return on plan assets     0 0 0
Amortization of transition and prior service costs (credits)     (21) (20) (6)
Amortization of actuarial loss     4 1 14
Net periodic benefit cost     26 26 62
Other postretirement charges     0 0 2
ERISA litigation matter     0 0 0
Total pension cost     $ 26 $ 26 $ 64
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost          
Discount rate     5.37% 5.67% 3.06%
Long-term rate of compensation increase     0.00% 0.00% 0.00%
ESOP growth rate     6.00% 6.00% 6.00%
Medical cost trend rate of increase     6.00% 6.25% 6.00%
Interest Crediting Rate     0.00% 0.00% 0.00%
United States | Pension Plans          
Components of Net Periodic Benefit Cost          
Service cost     $ 1 $ 0 $ 0
Interest cost     99 91 64
Expected return on plan assets     (85) (79) (101)
Amortization of transition and prior service costs (credits)     0 0 0
Amortization of actuarial loss     39 43 46
Net periodic benefit cost     54 55 9
Other postretirement charges     5 3 13
ERISA litigation matter   $ 267 0 267 0
Total pension cost     $ 59 $ 325 $ 22
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost          
Discount rate     5.40% 5.66% 2.98%
Expected long-term rate of return on plan assets     6.50% 6.25% 5.70%
Long-term rate of compensation increase     3.50% 3.50% 3.50%
ESOP growth rate     0.00% 0.00% 0.00%
Medical cost trend rate of increase     0.00% 0.00% 0.00%
Interest Crediting Rate     4.99% 5.21% 2.82%
International | Pension Plans          
Components of Net Periodic Benefit Cost          
Service cost     $ 16 $ 15 $ 15
Interest cost     33 33 21
Expected return on plan assets     (29) (25) (21)
Amortization of transition and prior service costs (credits)     1 1 1
Amortization of actuarial loss     5 5 7
Net periodic benefit cost     26 29 23
Other postretirement charges     0 2 4
ERISA litigation matter     0 0 0
Total pension cost     $ 26 $ 31 $ 27
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost          
Discount rate     4.61% 4.75% 2.10%
Expected long-term rate of return on plan assets     5.69% 4.66% 2.72%
Long-term rate of compensation increase     3.24% 3.22% 2.89%
ESOP growth rate     0.00% 0.00% 0.00%
Medical cost trend rate of increase     0.00% 0.00% 0.00%
Interest Crediting Rate     0.64% 2.28% 0.84%