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Commitments and Contingencies - Schedule of Product Warranty Reserves (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Balance at January 1 $ 277 $ 320    
Issuances/accruals during the period 218 252    
Settlements made during the period/other (216) (296)    
Balance at September 30 279 276    
Current portion     $ 204 $ 203
Non-current portion     75 73
Total 277 320 279 276
Product Warranty        
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Balance at January 1 277 251    
Issuances/accruals during the period 218 251    
Settlements made during the period/other (216) (226)    
Balance at September 30 279 276    
Current portion     204 203
Non-current portion     75 73
Total 277 251 279 276
Legacy Product Warranty        
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]        
Balance at January 1 0 69    
Issuances/accruals during the period 0 1    
Settlements made during the period/other 0 (70)    
Balance at September 30 0 0    
Current portion     0 0
Non-current portion     0 0
Total $ 0 $ 69 $ 0 $ 0