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Pension and Other Postretirement Benefits | 6 Months Ended
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Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefits | Note 5—Pension and Other Postretirement Benefits The Company sponsors various qualified and non-qualified defined benefit pension and other postretirement benefit plans that provide for retirement and medical benefits for substantially all employees residing in the United States. The components of net periodic benefit cost are as follows:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended March 31, |  | Six Months Ended March 31, |  | Three Months Ended March 31, |  | Six Months Ended March 31,
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
| (in millions)
Service cost | $ | 12 |  |  | $ | 12 |  |  | $ | 23 |  |  | $ | 22 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 11 |  |  | 9 |  |  | 21 |  |  | 18 |  |  | — |  |  | — |  |  | — |  |  | — |
Expected return on assets | (17 | ) |  | (15 | ) |  | (34 | ) |  | (31 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service credit | (2 | ) |  | (3 | ) |  | (4 | ) |  | (5 | ) |  | (1 | ) |  | — |  |  | (2 | ) |  | (1 | )
Actuarial loss | — |  |  | 7 |  |  | — |  |  | 14 |  |  | — |  |  | — |  |  | — |  |  | — |
Net benefit cost | $ | 4 |  |  | $ | 10 |  |  | $ | 6 |  |  | $ | 18 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (2 | ) |  | $ | (1 | )
Curtailment gain | (3 | ) |  | — |  |  | (3 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement loss | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total net periodic benefit cost | $ | 1 |  |  | $ | 10 |  |  | $ | 4 |  |  | $ | 18 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | (2 | ) |  | $ | (1 | )

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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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