Exhibit 12.1

Statement Regarding the Computation of Ratio of Earnings to Fixed Charges for the Five Years Ended December 31, 2016 and the Nine Months Ended September 30, 2017

	Years Ended December 31,															Nine Months Ended September 30, 2017
	2012			2013			2014			2015			2016
Fixed Charges:
Interest expense, net	$	788		$	1,013		$	1,165		$	1,291		$	1,317		$	1,052
Capitalized interest		101			45			101			163			200			177
Interest charges included in rental expense		6			16			17			19			9			7
Distribution to the Series A Convertible Redeemable Preferred Units		8			6			3			3			—			—
Accretion of the Series A Convertible Redeemable Preferred Units		1			—			—			—			—			—
Total fixed charges		904			1,080			1,286			1,476			1,526			1,236
Earnings:
Income from continuing operations before income tax expense and noncontrolling interest		1,817			810			1,593			1,398			438			1,439
Less: equity in earnings of unconsolidated affiliates		212			236			332			469			59			139
Total earnings		1,605			574			1,261			929			379			1,300
Add:
Fixed charges		904			1,080			1,286			1,476			1,526			1,236
Amortization of capitalized interest		5			6			8			11			18			15
Distributed income of equity investees		208			313			291			440			406			319
Less:
Interest capitalized		(101	)		(45	)		(101	)		(163	)		(200	)		(177	)
Income available for fixed charges	$	2,621		$	1,928		$	2,745		$	2,693		$	2,129		$	2,693
Ratio of earnings to fixed charges		2.9			1.8			2.1			1.8			1.4			2.2