Delphi (DPHIQ) said 12,400 workers agreed to retire and 1,400 took a buyout offer.

The bankrupt auto parts maker had offered some workers $35,000 to retire and others as much as $140,000 in buyouts. Delphi said 85% of eligible United Auto Workers union members took the retirement option.

Delphi's former parent,

GM

(GM) - Get Report

, has agreed to assume the financial obligations related to the lump sum payments to be made to eligible Delphi U.S. hourly employees accepting normal or voluntary retirement incentives. Additionally, GM will fund certain post-retirement employee benefit obligations related to Delphi employees who transition to GM under the plan for purposes of retirement as well as half of employee buyout costs.

News of the Delphi attrition offers come as the U.S. auto industry undergoes wrenching change. Detroit's Big Three have announced steep production cutbacks in a bid to accelerate their return to profitability, exacting a hefty cost on their workers and suppliers.