Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Summary of remaining operating lease payments

A summary of our remaining operating lease payments as of December 31, 2020 and December 31, 2019 follows (in millions).

	Year 1		Year 2		Year 3		Year 4		Year 5		Thereafter		Total lease payments		Amount representing interest			Lease liabilities
December 31:
2020	$	1,342	$	1,111	$	905	$	725	$	544	$	1,691	$	6,318	$	(849	)	$	5,469
2019		1,374		1,183		950		764		620		1,988		6,879		(997	)		5,882

Components of operating lease costs

Components of operating lease costs for the years ending December 31, 2020 and 2019, by type, are summarized in the following table (in millions). Operating lease expense was $1,649 million in 2018.

	2020			2019
Operating lease cost	$	1,413		$	1,459
Short-term lease cost		145			178
Variable lease cost		228			276
Sublease income		(10	)		(24	)
Total lease cost	$	1,776		$	1,889