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Retirement Plans and Other Retiree Benefits - Summary of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Retiree Benefit Plans      
Components of Net Periodic Benefit Cost      
Service cost $ 20 $ 15 $ 16
Interest cost 37 41 38
Expected return on plan assets (2) (3) (2)
Amortization of transition and prior service costs (credits) 0 0 0
Amortization of actuarial loss 18 11 14
Net periodic benefit cost 73 64 66
Other postretirement charges 0 0 0
Total pension cost $ 73 $ 64 $ 66
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 3.56% 4.43% 3.80%
Expected long-term rate of return on plan assets 6.30% 6.60% 6.60%
Long-term rate of compensation increase 0.00% 0.00% 0.00%
ESOP growth rate 10.00% 10.00% 10.00%
Medical cost trend rate of increase 6.00% 6.00% 6.00%
Interest Crediting Rate 0.00% 0.00% 0.00%
United States | Pension Plans      
Components of Net Periodic Benefit Cost      
Service cost $ 1 $ 1 $ 1
Interest cost 74 90 86
Expected return on plan assets (111) (103) (115)
Amortization of transition and prior service costs (credits) 0 0 0
Amortization of actuarial loss 46 51 47
Net periodic benefit cost 10 39 19
Other postretirement charges 4 7 9
Total pension cost $ 14 $ 46 $ 28
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 3.40% 4.38% 3.73%
Expected long-term rate of return on plan assets 6.30% 6.60% 6.60%
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 3.21% 4.26% 3.73%
International | Pension Plans      
Components of Net Periodic Benefit Cost      
Service cost $ 17 $ 14 $ 14
Interest cost 21 22 21
Expected return on plan assets (22) (19) (21)
Amortization of transition and prior service costs (credits) 0 1 0
Amortization of actuarial loss 9 9 8
Net periodic benefit cost 25 27 22
Other postretirement charges 0 1 2
Total pension cost $ 25 $ 28 $ 24
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost      
Discount rate 2.06% 2.80% 2.53%
Expected long-term rate of return on plan assets 3.38% 4.06% 4.04%
Long-term rate of compensation increase 2.83% 2.86% 2.79%
ESOP growth rate 0.00% 0.00% 0.00%
Medical cost trend rate of increase 0.00% 0.00% 0.00%
Interest Crediting Rate 0.85% 0.85% 0.85%