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Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Leases [Abstract]      
Operating Leases, Rent Expense, Net $ 211 $ 198 $ 182
Operating Leases, Future Minimum Payments Due [Abstract]      
2019 192    
2020 158    
2021 118    
2022 86    
2023 58    
2024 and Thereafter 177    
Operating Leases, Future Minimum Payments Due, Total 789    
Unconditional Purchase Obligations [Abstract]      
Unrecorded Unconditional Purchase Obligation $ 745    
Date by which the majority of unrecorded Unconditional purchase obligations will be settled Dec. 31, 2019    
Accrual for Environmental Loss Contingencies Disclosure [Abstract]      
Accrual for Environmental Loss Contingencies, Net $ 69    
Letters of Credit / Bank Guarantees [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 218    
Guarantor Obligations, Term Substantially all of these letters of credit and guarantees expire before 2025.    
Surety Bonds and Other Guarantees [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 28    
Guarantor Obligations, Term The expiration of these bonds and guarantees ranges through 2020.    
Lease Residual Value Guarantee [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted $ 147    
Businesses Sold [Member] | Pension Obligation Guarantee [Member]      
Guarantor Obligations [Line Items]      
Guarantor Obligations, Maximum Exposure, Undiscounted 38    
Product Liability, Workers Compensation and Other Personal Injury Matters [Member]      
Loss Contingency [Abstract]      
Loss Contingency Accrued 204    
Loss Contingency, Accrual, Gross 221    
Estimated Amount Due from Insurers, Net 86    
Estimated Amount Due from Insurers, Undiscounted $ 97    
Loss Contingency, Accrual, Weighted Average Discount Rate 4.67%    
Loss Contingency, Accrual, Discount Amount $ 17    
Estimated Amount Due from Insurers, Discount Amount 11    
Loss Contingency, Net, Discount Amount 6    
Loss Contingency Accrual, Product Liability, Gross, Divested Business 10    
Product Liability, Workers Compensation and Other Personal Injury Matters [Member] | Minimum [Member]      
Loss Contingency [Abstract]      
Loss Contingency, Estimate of Possible Loss 215    
Product Liability, Workers Compensation and Other Personal Injury Matters [Member] | Maximum [Member]      
Loss Contingency [Abstract]      
Loss Contingency, Estimate of Possible Loss $ 349