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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Data [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 5,704 | $ 5,575 | $ 5,742 | $ 4,944 | $ 5,258 |  | $ 5,303 | $ 5,731 | $ 4,854 |  |  |
Operating income | 820 | 798 | 972 | 616 | 741 |  | 845 | 1,215 | 606 | $ 3,206 | $ 3,407 | $ 3,522
Income before income taxes | 817 | 786 | 960 | 602 | 736 |  | 832 | 1,165 | 532 | 3,164 | 3,265 | 3,450
Net income | $ 654 | $ 615 | $ 733 | $ 463 | $ 1,747 | [1] | $ 528 | $ 743 | $ 339 | $ 2,465 | $ 3,357 | $ 2,183
Basic (in dollars per share) | $ 1.17 | $ 1.08 | $ 1.27 | $ 0.79 | $ 2.95 | [1] | $ 0.88 | $ 1.23 | $ 0.55 | $ 4.30 | $ 5.58 | $ 3.48
Diluted (in dollars per share) | $ 1.17 | $ 1.08 | $ 1.27 | $ 0.79 | $ 2.94 | [1] | $ 0.88 | $ 1.23 | $ 0.55 | $ 4.29 | $ 5.57 | $ 3.45
Change in federal statutory rate |  |  |  |  |  |  |  |  |  | $ 0 | $ 1,270 | $ 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  |  |  |  |  |  |  |  | 21.00% |  |
[1] | Includes a $1.3 billion reduction in Provision for income taxes related to the Tax Cuts and Jobs Act legislation enacted in December 2017, which resulted in a re-measurement of the Company's deferred tax assets and liabilities at the new federal corporate tax rate of 21 percent. See Note 14 to the Consolidated Financial Statements for further information.

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