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Revenue Recognition (Tables)
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Revenue by Type Within Each Business Segment
Revenue recognized for Year Ended December 31,
Revenue category202020192018
Gaming
Gaming operations$332 $597 $632 
Gaming machine sales312 609 646 
Gaming systems171 295 320 
Table products111 247 233 
Total$926 $1,748 $1,831 
Lottery
Instant products $579 $588 $592 
Lottery systems 339 323 254 
Total$918 $911 $846 
SciPlay
Mobile$506 $391 $323 
Web and other76 75 93 
Total$582 $466 $416 
Digital
Sports and platform$127 $119 $101 
Gaming and other171 156 169 
Total$298 $275 $270 
Summary of Contract Liabilities
The following table summarizes the activity in our contract liabilities for the reporting period:
Year Ended December 31, 2020
Contract liability balance, beginning of period(1)
$109 
Liabilities recognized during the period56 
Amounts recognized in revenue from beginning balance(76)
Contract liability balance, end of period(1)
$89 
(1) Contract liabilities are included within Accrued liabilities and Other long-term liabilities in our consolidated balance sheets.
The following table summarizes our opening and closing balances in these accounts (other than contract liabilities disclosed above):
Receivables
Contract Assets(1)
End of period balance, December 31, 2019
$808 $121 
End of period balance, December 31, 2020
636 127 
(1) Contract assets are included primarily within Prepaid expenses, deposits and other current assets in our consolidated balance sheets.