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Retirement Plans and Other Retiree Benefits - Summary of Defined Benefit and Other Retiree Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts Recognized in Balance Sheet      
Current liabilities $ (89) $ (54)  
Pension Plans      
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Expected long-term rate of return on plan assets 5.70%    
Other Retiree Benefit Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 1,050 876  
Service cost 20 15 $ 16
Interest cost 37 41 38
Participants’ contributions 0 0  
Acquisitions/plan amendments 0 0  
Actuarial loss (gain) 61 166  
Foreign exchange impact (9) 1  
Termination benefits 0 0  
Curtailments and settlements 0 0  
Benefit payments (47) (49)  
Other 0 0  
Benefit obligations at end of year 1,112 1,050 876
Change in Plan Assets      
Fair value of plan assets at beginning of year 37 54  
Actual return on plan assets 2 8  
Company contributions 11 24  
Participants’ contributions 0 0  
Foreign exchange impact 0 0  
Settlements and acquisitions 0 0  
Benefit payments (47) (49)  
Other 0 0  
Fair value of plan assets at end of year 3 37 54
Funded Status      
Benefit obligations at end of year 1,112 1,050 876
Fair value of plan assets at end of year 3 37 54
Net amount recognized (1,109) (1,013)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 0 0  
Current liabilities (45) (13)  
Noncurrent liabilities (1,064) (1,000)  
Net amount recognized (1,109) (1,013)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 429 388  
Transition/prior service cost 0 (1)  
Amounts recognized in accumulated other comprehensive income 429 387  
Accumulated benefit obligation $ 0 $ 0  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 2.88% 3.56%  
Expected long-term rate of return on plan assets 5.70% 6.30%  
Long-term rate of compensation increase 3.50% 3.50%  
ESOP growth rate 10.00% 10.00%  
Medical cost trend rate of increase 6.00% 6.00%  
Interest Crediting Rate 0.00% 0.00%  
United States | Pension Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 2,272 $ 2,147  
Service cost 1 1 1
Interest cost 74 90 86
Participants’ contributions 0 0  
Acquisitions/plan amendments 0 0  
Actuarial loss (gain) 171 181  
Foreign exchange impact 0 0  
Termination benefits 3 7  
Curtailments and settlements (3) 0  
Benefit payments (155) (154)  
Other 0 0  
Benefit obligations at end of year 2,363 2,272 2,147
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,806 1,568  
Actual return on plan assets 243 262  
Company contributions 30 130  
Participants’ contributions 0 0  
Foreign exchange impact 0 0  
Settlements and acquisitions (3) 0  
Benefit payments (155) (154)  
Other 0 0  
Fair value of plan assets at end of year 1,921 1,806 1,568
Funded Status      
Benefit obligations at end of year 2,363 2,272 2,147
Fair value of plan assets at end of year 1,921 1,806 1,568
Net amount recognized (442) (466)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 20 0  
Current liabilities (30) (28)  
Noncurrent liabilities (432) (438)  
Net amount recognized (442) (466)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 902 910  
Transition/prior service cost 1 1  
Amounts recognized in accumulated other comprehensive income 903 911  
Accumulated benefit obligation $ 2,325 $ 2,236  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 2.65% 3.40%  
Expected long-term rate of return on plan assets 5.70% 6.30%  
Long-term rate of compensation increase 3.50% 3.50%  
ESOP growth rate 0.00% 0.00%  
Medical cost trend rate of increase 0.00% 0.00%  
Interest Crediting Rate 2.48% 3.21%  
International | Pension Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 876 $ 787  
Service cost 17 14 14
Interest cost 21 22 21
Participants’ contributions 5 2  
Acquisitions/plan amendments 30 3  
Actuarial loss (gain) 65 82  
Foreign exchange impact 46 8  
Termination benefits 0 0  
Curtailments and settlements (7) (9)  
Benefit payments (40) (35)  
Other 0 2  
Benefit obligations at end of year 1,013 876 787
Change in Plan Assets      
Fair value of plan assets at beginning of year 586 510  
Actual return on plan assets 59 76  
Company contributions 36 30  
Participants’ contributions 5 2  
Foreign exchange impact 26 12  
Settlements and acquisitions 26 (9)  
Benefit payments (40) (35)  
Other 0 0  
Fair value of plan assets at end of year 698 586 510
Funded Status      
Benefit obligations at end of year 1,013 876 787
Fair value of plan assets at end of year 698 586 $ 510
Net amount recognized (315) (290)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 18 13  
Current liabilities (14) (13)  
Noncurrent liabilities (319) (290)  
Net amount recognized (315) (290)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 255 238  
Transition/prior service cost 7 7  
Amounts recognized in accumulated other comprehensive income 262 245  
Accumulated benefit obligation $ 946 $ 816  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 1.61% 2.06%  
Expected long-term rate of return on plan assets 2.93% 3.38%  
Long-term rate of compensation increase 2.62% 2.83%  
ESOP growth rate 0.00% 0.00%  
Medical cost trend rate of increase 0.00% 0.00%  
Interest Crediting Rate 0.83% 0.85%