Additional Information

12 Months Ended

Dec. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Additional Information

Additional Information

	For the Years Ended December 31,
(in millions)	2020		2019		2018
Research and development expense	$	131	$	168	$	252
Advertising expense	$	26	$	33	$	37
Interest and other debt expense, net:
Interest expense	$	1,223	$	1,322	$	697
Interest income	(14)		(42)		(32)
	$	1,209	$	1,280	$	665

The activity in the allowance for discounts and allowance for returned goods for the years ended December 31, 2020, 2019 and 2018 was as follows:

(in millions)	2020				2019				2018
	Discounts		Returned Goods		Discounts		Returned Goods		Discounts		Returned Goods
Balance at beginning of year	$	—	$	32	$	—	$	32	$	—	$	40
Charged to costs and expenses	633		98		604		127		620		97
Deductions (1)	(633)		(90)		(604)		(127)		(620)		(105)
Balance at end of year	$	—	$	40	$	—	$	32	$	—	$	32

(1) Represents the recording of discounts and returns for which allowances were created.

The activity in the allowance for losses on finance assets for the years ended December 31, 2020, 2019 and 2018 was as follows:

(in millions)	2020		2019		2018
Balance at beginning of year	$	19	$	19	$	23
Decrease to allowance	—		—		(4)
Balance at end of year	$	19	$	19	$	19