Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule Of Quarterly Financial Data

	2017												2016
	4th			3rd			2nd			1st			4th			3rd			2nd			1st
Total revenues		$25,368			$24,309			$22,739			$20,976			$23,286			$23,898			$24,755			$22,632
Total costs and expenses	(20,427		)	(19,987		)	(18,388		)	(17,264		)	(19,464		)	(19,904		)	(22,325		)	(19,097		)
Earnings from operations	3,030			2,689			2,535			2,024			2,183			2,282			(419		)	1,788
Net earnings/(loss)	3,132			1,853			1,761			1,451			1,631			2,279			(234		)	1,219
Basic earnings/(loss) per share	5.25			3.10			2.93			2.36			2.63			3.64			(0.37		)	1.85
Diluted earnings/(loss) per share	5.18			3.06			2.89			2.34			2.59			3.60			(0.37		)	1.83
Cash dividends declared per share	3.13						2.84						2.51						2.18
Common stock sales price per share:
High	299.33			259.30			204.39			185.71			160.07			139.45			137.89			141.70
Low	253.53			197.75			175.47			155.21			130.74			123.96			122.35			102.10
Quarter end	294.91			254.21			197.75			176.86			155.68			131.74			129.87			126.94