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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2012 First Quarter | Dec. 31, 2011 First Quarter | Mar. 31, 2013 Second Quarter | Mar. 31, 2012 Second Quarter | Jun. 30, 2013 Third Quarter | Jun. 30, 2012 Third Quarter | Sep. 30, 2013 Fourth Quarter | Sep. 30, 2012 Fourth Quarter
Operating revenues | $ 10,956 | $ 11,220 | $ 11,841 | $ 2,579 | $ 2,568 | $ 2,741 | $ 2,604 | $ 2,602 | $ 2,777 | $ 3,034 | $ 3,271
Operating expenses | 9,503 | 9,920 | 10,404 | 2,523 | 2,431 | 2,380 | 2,358 | 2,324 | 2,499 | 2,276 | 2,632
Operating income | 1,453 | 1,300 | 1,437 | 56 | 137 | 361 | 246 | 278 | 278 | 758 | 639
Net income (loss) | $ 271 | $ 60 | $ 162 | $ (245) | $ (173) | $ 54 | $ (94) | $ (12) | $ (23) | $ 474 | $ 350

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e565-108580 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5 + Details
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