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Pension and Other Postretirement Benefits (Tables) | 6 Months Ended
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Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract] |
Schedule of Defined Benefit Plans Disclosures | 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 Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2439-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2410-114920 + Details
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