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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly FInancial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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 | [1] | Dec. 31, 2016 | [1]
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 10,491 | $ 11,003 | $ 10,777 | $ 9,032 | $ 9,451 | $ 9,899 | $ 10,008 | $ 8,426 | $ 41,303 | $ 37,784 |  | $ 36,558 |
Operating income | 652 | 1,203 | 1,161 | 276 | 776 | 1,138 | 1,437 | 320 | 3,292 | 3,671 |  | 4,344 |
Net income | $ 462 | $ 836 | $ 684 | $ 147 | $ 579 | $ 645 | $ 821 | $ 99 | $ 2,129 | $ 2,144 | [2],[3],[4] | $ 2,234 | [2],[3],[4]
Earnings per share, basic (in dollars per share) | $ 1.71 | $ 3.07 | $ 2.49 | $ 0.52 | $ 1.99 | $ 2.15 | $ 2.67 | $ 0.32 | $ 7.73 | $ 7.08 |  | $ 6.77 |
Earnings per share, diluted (in dollars per share) | $ 1.70 | $ 3.06 | $ 2.48 | $ 0.52 | $ 1.98 | $ 2.15 | $ 2.67 | $ 0.32 | $ 7.70 | $ 7.06 |  | $ 6.76 |
[1] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) and Accounting Standards Update No. 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[2] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[3] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.
[4] | Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part II, Item 8 of this report for additional information.

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