B737 flight crew reported encountering wake turbulence on arrival into ord in trail of a B777.

Attributes
ACN	1762475
Time
Date	202009
Local Time Of Day	1201-1800
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 Undifferentiated or Other Model
Flight Phase	Initial Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 76 Flight Crew Type 2284
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Experience	Flight Crew Last 90 Days 99 Flight Crew Total 5809 Flight Crew Type 4260
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

In descent from 9000 to 7000 with autopilot engaged hit by moderate jolt of wake turbulence. Continued descent and aircraft began to roll past 30 degrees angle of bank. Autopilot disengaged and aircraft rolled upright. Autopilot reengaged. Checked on flight attendants; all were ok. No passengers were up at the time. Enquired ATC about who we were following. Appeared to be a B777 ahead going to a different runway.

Original NASA ASRS Text

Title: B737 flight crew reported encountering wake turbulence on arrival into ORD in trail of a B777.

Narrative: In descent from 9000 to 7000 with autopilot engaged hit by moderate jolt of wake turbulence. Continued descent and aircraft began to roll past 30 degrees angle of bank. Autopilot disengaged and aircraft rolled upright. Autopilot reengaged. Checked on flight attendants; all were ok. No passengers were up at the time. Enquired ATC about who we were following. Appeared to be a B777 ahead going to a different runway.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.