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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts Recognized in Balance Sheet      
Current liabilities $ (54) $ (84)  
Pension Plans      
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Long-term rate of return on plan assets 6.30%    
Other Retiree Benefit Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 876 960  
Service cost 15 16 $ 13
Interest cost 41 38 40
Participants’ contributions 0 0  
Acquisitions/plan amendments 0 0  
Actuarial loss (gain) 166 (88)  
Foreign exchange impact 1 (5)  
Termination benefits 0 0  
Curtailments and settlements 0 0  
Benefit payments (49) (45)  
Other 0 0  
Benefit obligations at end of year 1,050 876 960
Change in Plan Assets      
Fair value of plan assets at beginning of year 54 0  
Actual return on plan assets 8 (1)  
Company contributions 24 100  
Participants’ contributions 0 0  
Foreign exchange impact 0 0  
Settlements and acquisitions 0 0  
Benefit payments (49) (45)  
Other 0 0  
Fair value of plan assets at end of year 37 54 0
Funded Status      
Benefit obligations at end of year 1,050 876 960
Fair value of plan assets at end of year 37 54 0
Net amount recognized (1,013) (822)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 0 0  
Current liabilities (13) (46)  
Noncurrent liabilities (1,000) (776)  
Net amount recognized (1,013) (822)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 388 239  
Transition/prior service cost (1) (1)  
Amounts recognized in accumulated other comprehensive income $ 387 $ 238  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 3.56% 4.43%  
Long-term rate of return on plan assets 6.30% 6.60%  
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%  
Assumed medical cost trend rates [Abstract]      
Medical cost trend rate assumed for next fiscal year 6.00%    
Ultimate medical cost trend rate 4.75%    
Year which ultimate medical cost trend rate is reached 2025    
United States | Pension Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 2,147 $ 2,363  
Service cost 1 1 1
Interest cost 90 86 94
Participants’ contributions 0 0  
Acquisitions/plan amendments 0 0  
Actuarial loss (gain) 181 (139)  
Foreign exchange impact 0 0  
Termination benefits 7 9  
Curtailments and settlements 0 (4)  
Benefit payments (154) (169)  
Other 0 0  
Benefit obligations at end of year 2,272 2,147 2,363
Change in Plan Assets      
Fair value of plan assets at beginning of year 1,568 1,812  
Actual return on plan assets 262 (101)  
Company contributions 130 30  
Participants’ contributions 0 0  
Foreign exchange impact 0 0  
Settlements and acquisitions 0 (4)  
Benefit payments (154) (169)  
Other 0 0  
Fair value of plan assets at end of year 1,806 1,568 1,812
Funded Status      
Benefit obligations at end of year 2,272 2,147 2,363
Fair value of plan assets at end of year 1,806 1,568 1,812
Net amount recognized (466) (579)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 0 0  
Current liabilities (28) (26)  
Noncurrent liabilities (438) (553)  
Net amount recognized (466) (579)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 910 940  
Transition/prior service cost 1 1  
Amounts recognized in accumulated other comprehensive income 911 941  
Accumulated benefit obligation $ 2,236 $ 2,090  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 3.40% 4.38%  
Long-term rate of return on plan assets   6.60%  
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 3.21% 4.38%  
Long-term rate of return on plan assets [Abstract]      
Average annual rates of return for the most recent 1-year period 17.00%    
Average annual rates of return for the most recent 5-year period 6.00%    
Average annual rates of return for the most recent 10-year period 8.00%    
Average annual rates of return for the most recent 15-year period 7.00%    
Average annual rates of return for the most recent 25-year period 8.00%    
International | Pension Plans      
Change in Benefit Obligations      
Benefit obligations at beginning of year $ 787 $ 847  
Service cost 14 14 16
Interest cost 22 21 22
Participants’ contributions 2 2  
Acquisitions/plan amendments 3 4  
Actuarial loss (gain) 82 (11)  
Foreign exchange impact 8 (40)  
Termination benefits 0 0  
Curtailments and settlements (9) (7)  
Benefit payments (35) (42)  
Other 2 (1)  
Benefit obligations at end of year 876 787 847
Change in Plan Assets      
Fair value of plan assets at beginning of year 510 575  
Actual return on plan assets 76 (16)  
Company contributions 30 27  
Participants’ contributions 2 3  
Foreign exchange impact 12 (29)  
Settlements and acquisitions (9) (7)  
Benefit payments (35) (42)  
Other 0 (1)  
Fair value of plan assets at end of year 586 510 575
Funded Status      
Benefit obligations at end of year 876 787 847
Fair value of plan assets at end of year 586 510 $ 575
Net amount recognized (290) (277)  
Amounts Recognized in Balance Sheet      
Noncurrent assets 13 6  
Current liabilities (13) (12)  
Noncurrent liabilities (290) (271)  
Net amount recognized (290) (277)  
Amounts Recognized in Accumulated Other Comprehensive Income (Loss)      
Actuarial loss 238 226  
Transition/prior service cost 7 6  
Amounts recognized in accumulated other comprehensive income 245 232  
Accumulated benefit obligation $ 816 $ 731  
Weighted-Average Assumptions Used to Determine Benefit Obligations      
Discount rate 2.06% 2.80%  
Long-term rate of return on plan assets 3.38% 4.06%  
Long-term rate of compensation increase 2.83% 2.86%  
ESOP growth rate 0.00% 0.00%  
Medical cost trend rate of increase 0.00% 0.00%  
Interest Crediting Rate 0.85% 0.85%