Revenue

The following table disaggregates our revenue by major source:



	Three Months Ended March 31, 2018
	GMNA		GMI		Corporate		Total Automotive		GM Financial		Eliminations			Total
Vehicle, parts and accessories	$	25,882	$	4,605	$	9	$	30,496	$	—	$	(7	)	$	30,489
Used vehicles	1,155		47		—		1,202		—		(17		)	1,185
Services and other	781		196		40		1,017		—		—			1,017
Automotive net sales and revenue	27,818		4,848		49		32,715		—		(24		)	32,691
Leased vehicle income	—		—		—		—		2,447		—			2,447
Finance charge income	—		—		—		—		866		(2		)	864
Other income	—		—		—		—		98		(1		)	97
GM Financial net sales and revenue	—		—		—		—		3,411		(3		)	3,408
Net sales and revenue	$	27,818	$	4,848	$	49	$	32,715	$	3,411	$	(27	)	$	36,099

Revenue is measured as the amount of consideration we expect to receive in exchange for transferring goods or providing services. Adjustments to sales incentives for previously recognized sales decreased revenue by an insignificant amount during the three months ended March 31, 2018.

Deferred revenue consists primarily of maintenance, extended warranty and other service contracts. We recognized revenue of $383 million related to previously deferred revenue during the three months ended March 31, 2018. We expect to recognize revenue of $1.1 billion in the nine months ending December 31, 2018 and $780 million, $404 million and $476 million in the years ending December 31, 2019, 2020 and thereafter related to deferred revenue as of March 31, 2018.