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Warranty Liability (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Changes in warranty liability    
Balance at beginning of period $ 149 $ 164
Provision 30 34
Settlements (38) (39)
Adjustments (5) 7
Balance at end of period $ 136 $ 166