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Employee Benefits | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Employee Benefits | 9. Employee Benefits U.S. Defined-Benefit Pension and Supplemental Executive Retirement Plans We maintain non-contributory, defined-benefit pension plans, non-qualified supplemental executive retirement plans, or SERPs, for certain senior executives and post-retirement benefit plans for eligible employees in the U.S., collectively referred to as the NASDAQ OMX Benefit Plans. Our pension plans and SERPs are frozen. Future service and salary for all participants do not count toward an accrual of benefits under the pension plans and SERPs. Components of Net Periodic Benefit Cost The following table sets forth the components of net periodic pension, SERP and post-retirement benefits costs from the NASDAQ OMX Benefit Plans recognized in compensation and benefits expense in the Condensed Consolidated Statements of Income:
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
|  | (in millions)
Components of net periodic benefit cost |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 1 |  | $ | 2 |  | $ | 4 |  | $ | 5
Expected return on plan assets |  |  | (1) |  |  | (1) |  |  | (4) |  |  | (4)
Recognized net actuarial loss |  |  | 1 |  |  | - |  |  | 3 |  |  | 2
Curtailment loss |  |  | - |  |  | - |  |  | 1 |  |  | -
Net periodic benefit cost |  | $ | 1 |  | $ | 1 |  | $ | 4 |  | $ | 3
Non-U.S. Benefit Plans Most employees outside the U.S. are covered by local retirement plans or by applicable social laws. Benefits under social laws are generally expensed in the periods in which the costs are incurred. These costs are included in compensation and benefits expense in the Condensed Consolidated Statements of Income and were $5 million for the three months ended September 30, 2013, $4 million for the three months ended September 30, 2012, $14 million for the nine months ended September 30, 2013, and $13 million for the nine months ended September 30, 2012. U.S. Defined Contribution Savings Plan We sponsor a voluntary defined contribution savings plan, or 401(k) Plan, for U.S. employees. Employees are immediately eligible to make contributions to the plan a nd are also eligible for an employer contribution match at an amount equal to 100.0% of the first 4.0% of eligible employee contributions. Savings plan expense included in compensation and benefits expense in the Condensed Consolidated Statements of Income was $2 million for the three months ended September 30, 2013, $1 million for the three months ended September 30, 2012, and $4 million for both the nine months ended September 30, 2013 and 2012. We have a profit-sharing contribution feature to our 401(k) plan which allows eligible U.S. employees to receive employer retirement contributions, or ERCs, when we meet our annual corporate goals. In addition, we have a supplemental ERC for select highly compensated employees whose ERCs are limited by the annual Internal Revenue Service compensation limit. ERC expense recorded in compensation and benefits expense in the Condensed Consolidated Statements of Income was $3 million for the three mo nths ended September 30, 2013, $1 million for the three months ended September 30, 2012, $4 million for the nine months ended September 30, 2013, and $2 million for the nine months ended September 30, 2012. Employee Stock Purchase Plan We have an employee stock purchase plan, or ESPP, under which approximately 3.2 million shares of our common stock have been re served for future issuance as of September 30, 2013. Our ESPP allows eligible U.S. and non-U.S. employees to purchase a limited number of shares of our common stock at six-month intervals, called offering periods, at 85.0% of the lower of the fair market value on the first or the last day of each offering period. The 15.0% discount given to our employees is included in compensation and benefits expens e in the Condensed Consolidated Statements of Income and was $1 million for both the three months ended September 30, 201 3 and 2012 and $2 million for both the nine months ended September 30, 2013 and 2012.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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