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Operating Revenue by Principle Geographic Region (Detail) - USD ($) $ 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
Segment Reporting Information [Line Items]
Total revenues	$ 9,438	$ 9,878	$ 10,000	$ 8,420	$ 9,052	$ 9,913	$ 9,396	$ 8,195	$ 37,736	$ 36,556	$ 37,864
Domestic (U.S. and Canada)
Segment Reporting Information [Line Items]
Total revenues									23,131	22,202	21,931
Pacific
Segment Reporting Information [Line Items]
Total revenues									4,898	4,959	5,498
Atlantic
Segment Reporting Information [Line Items]
Total revenues									6,285	6,157	7,068
Latin America
Segment Reporting Information [Line Items]
Total revenues									$ 3,422	$ 3,238	$ 3,367

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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