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Quarterly data (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly revenues and earnings

A summary of revenues and net earnings by quarter for each of the last two years follows. This information is unaudited. Amounts are in millions, except per share amounts.


		1^st Quarter				2^nd Quarter				3^rd Quarter				4^th Quarter
2017
Revenues		$	65,187			$	57,518			$	60,525			$	58,907
Net earnings attributable to Berkshire shareholders *			4,060				4,262				4,067				32,551
Net earnings attributable to Berkshire shareholders per equivalent Class A common share			2,469				2,592				2,473				19,790
2016
Revenues		$	52,163			$	54,254			$	58,843			$	58,344
Net earnings attributable to Berkshire shareholders *			5,589				5,001				7,198				6,286
Net earnings attributable to Berkshire shareholders per equivalent Class A common share			3,401				3,042				4,379				3,823

*	Includes after-tax investment and derivative gains/losses and a one-time income tax net benefit attributable to the enactment of the Tax Cuts and Jobs Act of 2017 as follows:


		1^st Quarter				2^nd Quarter				3^rd Quarter				4^th Quarter
Investment and derivative gains/losses – 2017		$	504			$	143			$	623			$	107
Investment and derivative gains/losses – 2016			1,852				394				2,347				1,904
Income tax net benefit – Tax Cuts and Jobs Act of 2017			—				—				—				28,200