Schedule II: Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2020

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Schedule II: Valuation and Qualifying Accounts

Schedule II: Valuation and Qualifying Accounts

The table below details the activity of the allowance for credit losses and sales credits for the years ended December 31, 2018, 2019 and 2020 (in millions):

	Balance at Beginning of Year		Additions		Usage		Balance at End of Year
Year ended December 31, 2018	$	674	$	1,115	$	(1,060)	$	729
Year ended December 31, 2019	$	729	$	1,481	$	(1,457)	$	753
Year ended December 31, 2020	$	753	$	2,013	$	(1,422)	$	1,344

Note: Additions to the allowance for credit losses are charged to expense. Additions to the allowance for sales credits are charged against revenues.