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Employee Retirement Plans
 9 Months Ended
Sep. 30, 2013
Compensation And Retirement Disclosure [Abstract]  
Employee Retirement Plans
K. Net periodic pension cost for the Company’s defined-benefit pension plans was as follows, in millions:

Three Months Ended September 30,
2013 2012
Qualified Non-Qualified Qualified Non-Qualified

Service cost

 $ 1 $ — $ 1 $ —

Interest cost

 9 2 13 2

Expected return on plan assets

 (9 ) — (10 ) —

Amortization of net loss

 4 1 3 —

Net periodic pension cost

 $ 5 $ 3 7 2

Nine Months Ended September 30,
2013 2012
Qualified Non-Qualified Qualified Non-Qualified

Service cost

 $ 3 $ — $ 4 $ —

Interest cost

 29 5 33 5

Expected return on plan assets

 (27 ) — (27 ) —

Amortization of net loss

 12 2 10 1

Net periodic pension cost

 $ 17 $ 7 $ 20 $ 6

The Company participates in 20 regional multi-employer pension plans, principally related to building trades; none of the plans are considered significant to the Company.

Effective January 1, 2010, the Company froze all future benefit accruals under substantially all of the Company’s domestic qualified and non-qualified defined benefit pension plans. Future benefit accruals related to the Company’s foreign non-qualified plans were frozen several years ago.