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Quarterly Financial Data (Unaudited) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 2,207 | $ 2,188 | $ 2,199 | $ 2,159 | $ 2,210 | $ 2,183 | $ 2,195 | $ 2,260 | $ 6,635 | $ 8,753 | $ 8,848
Operating income | 507 | 493 | 525 | 553 | 525 | 459 | 455 | 466 | 1,199 | 2,078 | 1,905
Income tax expense | 142 | 139 | 155 | 166 | 160 | 133 | 113 | 136 | 349 | 602 | 542
Net Income (Loss) Attributable to Parent | $ 236 | $ 218 | $ 246 | $ 264 | $ 241 | $ 212 | $ 178 | $ 218 | $ 543 | $ 964 | $ 849

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