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Postretirement Benefit Plans. We sponsor a number of postretirement benefit plans that provide health and life benefits to eligible retirees. Such benefits are provided primarily from domestic plans, which comprise approximately 88% of the benefit obligation. The postretirement plans are primarily unfunded. Assets in funded plans are primarily invested in cash and cash equivalents. 

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As part of our acquisition of Goodrich on July 26, 2012, we assumed approximately $328 million of postretirement projected benefit obligations. 

We modified the postretirement medical benefits provided to legacy Goodrich salaried employees by eliminating any company 

subsidy for retirements that occur after January 31, 2014. This resulted in a $16 million reduction in the projected benefit obligation as of July 26, 2012. 

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Other changes in plan assets and benefit obligations recog- nized in other comprehensive loss in 2012 are as follows: 

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The estimated amounts that will be amortized from accumu- lated other comprehensive loss into net periodic benefit cost in 2013 include actuarial net gains of $4 million and prior service credit of $11 million. 

Major assumptions used in determining the benefit obliga- tion and net cost for postretirement plans are presented in the fol- lowing table as weighted-averages: 

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The components of net periodic benefit cost are as follows: 

Assumed health care cost trend rates are as follows: 

