Exhibit 12.1

	Nine Months Ended September 30,						Year Ended December 31,
	2017			2016			2016			2015			2014			2013			2012
Earnings before income taxes	$	4,611		$	5,684		$	6,636		$	7,157		$	1,072		$	2,527		$	1,025
Add (deduct):
Fixed charges from below		396			408			528			584			737			947			1,116
Capitalized interest		(43	)		(39	)		(53	)		(36	)		(33	)		(29	)		(21	)
Earnings as adjusted	$	4,964		$	6,053		$	7,111		$	7,705		$	1,776		$	3,445		$	2,120
Fixed Charges:
Interest expense, including capitalized amounts and amortization of debt costs	$	361		$	359		$	472		$	534		$	691		$	891		$	1,044
Portion of rental expense representative of the interest factor		35			49			56			50			46			56			72
	$	396		$	408		$	528		$	584		$	737		$	947		$	1,116
Ratio of Earnings to Fixed Charges		12.55			14.82			13.47			13.19			2.41			3.64			1.90