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OTHER COMMITMENTS AND CONTINGENCIES - Warranty (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Changes in the company's warranty liability    
Balance at January 1 $ 205 $ 192
Accruals for warranties issued during the year 78 63
Accruals related to pre-existing warranties (1) 9
Settlements made (in cash or kind) during the year (65) (59)
Balance at December 31 $ 217 $ 205