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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited)
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| (Dollars in millions)
2015 |  |  |  |  |  |  |  |  |
Operating revenues | $ | 2,217 |  |  | 2,222 |  |  | 2,287 |  |  | 2,238 |  |  | 8,964 |
Operating income | 545 |  |  | 521 |  |  | 572 |  |  | 622 |  |  | 2,260 |
Income tax expense | 167 |  |  | 152 |  |  | 171 |  |  | 169 |  |  | 659 |
Net income | 247 |  |  | 238 |  |  | 268 |  |  | 321 |  |  | 1,074 |
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| (Dollars in millions)
2014 |  |  |  |  |  |  |  |  |
Operating revenues | $ | 2,211 |  |  | 2,206 |  |  | 2,198 |  |  | 2,223 |  |  | 8,838 |
Operating income | 542 |  |  | 546 |  |  | 528 |  |  | 496 |  |  | 2,112 |
Income tax expense | 160 |  |  | 162 |  |  | 156 |  |  | 161 |  |  | 639 |
Net income | 253 |  |  | 256 |  |  | 245 |  |  | 216 |  |  | 970 |
During the third quarter of 2015, we recognized an incremental $64 million of revenue associated with the FCC's CAF Phase 2 support program, and an additional incremental $31 million in the fourth quarter of 2015.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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