Warranty Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability
The table below summarizes the activity in the product warranty liability for the nine months ended September 30, 2016:
 
Warranty Obligations
 
 
 
(in millions)
Accrual balance at beginning of period
$
131

Provision for estimated warranties incurred during the period
45

Changes in estimate for pre-existing warranties
6

Settlements made during the period (in cash or in kind)
(61
)
Accrual balance at end of period
$
121