Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 123; Flight Crew Total 2365; Flight Crew Type 123
Workload; Distraction
Deviation - Altitude Crossing Restriction Not Met; Deviation / Discrepancy - Procedural Clearance
Flight Crew Became Reoriented
Environment - Non Weather Related; Human Factors
Assigned DRLLR 5 arrival into IAH. We were planning 26R RNAV Y. We were cleared to descend via the DRLLR 5. 6000 was set in altitude window and aircraft was in LNAV/VNAV. Runway was not assigned so approaching SKLER; Captain queried ATC. ATC advised ILS 26R. Crew discussed ensuring proceeding straight after SKLER. Captain as Pilot Monitoring began to change the approach in the FMC; in the process the aircraft leveled off at 7000; rather continuing the decent to 6000. We recognize this a couple miles from SKLER but before we were able to notify ATC that we might be high at SKLER; ATC assigned us a descent to 5000. We proceeded to descend to the new altitude and land uneventfully.
First Officer reported leveling off high while they attempted to reprogram the FMC following a late runway assignment on the DRLLR FIVE STAR into IAH.