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Schedule of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Selected Quarterly Financial Data [Line Items]
Operating revenue	$ 9,438	$ 9,878	$ 10,000	$ 8,420	$ 9,052	$ 9,913	$ 9,396	$ 8,195	$ 37,736	$ 36,556	$ 37,864
Income from operations	729	1,092	1,399	278	1,005	1,624	1,060	649	3,498	4,338	5,166
Net income	$ 580	$ 637	$ 818	$ 96	$ 397	$ 965	$ 588	$ 313	$ 2,131	$ 2,263	$ 7,340
Basic earnings per share	$ 1.99	$ 2.12	$ 2.67	$ 0.31	$ 1.26	$ 3.02	$ 1.78	$ 0.88	$ 7.04	$ 6.86	$ 19.52
Diluted earnings per share	$ 1.99	$ 2.12	$ 2.66	$ 0.31	$ 1.26	$ 3.01	$ 1.78	$ 0.88	$ 7.02	$ 6.85	$ 19.47

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Selected Quarterly Financial Data [Line Items]

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