Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Summary of remaining operating lease payments

 A summary of our remaining operating lease payments as of March 31, 2019 and December 31, 2018 follows (in millions).

	2019		2020		2021		2022		2023		Thereafter		Total lease payments		Amount representing interest			Lease liabilities
March 31, 2019	$	933	$	1,312	$	1,091	$	859	$	685	$	2,183	$	7,063	$	(1,053	)	$	6,010
December 31, 2018		1,310		1,268		1,048		820		658		2,079		7,183

Components of operating lease costs

Components of operating lease costs by type were as follows (in millions).

	Operating lease cost		Short-term lease cost		Variable lease cost		Sublease income			Total lease cost
First quarter of 2019	$	361	$	44	$	69	$	(6	)	$	468

Summary of operating lease revenues by type

Operating lease revenues by type were as follows (in millions).

	Fixed lease revenue			Variable lease revenue			Total
First quarter of 2019		$	1,074		$	362		$	1,436

Summary of future operating lease rentals to be received

Future operating lease rentals to be received on assets we lease to others were as follows (in millions).

	2019		2020		2021		2022		2023		Thereafter		Total
As of March 31, 2019	$	1,932	$	1,928	$	1,363	$	893	$	529	$	485	$	7,130