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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 2,238 | $ 2,287 | $ 2,222 | $ 2,217 | $ 2,223 | $ 2,198 | $ 2,206 | $ 2,211 | $ 8,964 | $ 8,838 | $ 8,753
Operating income | 622 | 572 | 521 | 545 | 496 | 528 | 546 | 542 | 2,260 | 2,112 | 2,078
Income tax expense | 169 | 171 | 152 | 167 | 161 | 156 | 162 | 160 | 659 | 639 | 602
Net income | 321 | 268 | $ 238 | $ 247 | $ 216 | $ 245 | $ 256 | $ 253 | $ 1,074 | $ 970 | $ 964
Incremental increase in other operating revenues - CAF Phase II | $ 31 | $ 64 |  |  |  |  |  |  |  |  |

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