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Contract Assets and Liabilities
 9 Months Ended
Sep. 30, 2023
Revenue from Contract with Customer [Abstract]  
Contract Assets and Liabilities Contract Assets and Liabilities
The following summarizes information about our contract assets and liabilities:
(in millions)September 30, 2023December 31, 2022
Information about contract assets:
Contract assets
Unbilled receivables - reimbursable contracts$908 $738 
Contract work in progress - lump-sum contracts155 177 
Contract assets$1,063 $915 
Advance billings deducted from contract assets$211 $220 
9ME
September 30,
(in millions)20232022
Information about contract liabilities:
Revenue recognized that was included in contract liabilities as of January 1$566 $812 
We periodically evaluate our project forecasts and the amounts recognized with respect to our claims and unapproved change orders. We include estimated amounts for claims and unapproved change orders in project revenue to the extent it is probable we will realize those amounts. As of September 30, 2023 and December 31, 2022, we had recorded $648 million and $498 million, respectively, of revenue associated with claims and unapproved change orders for costs incurred to date. Additional costs, which will increase this balance over time, are expected to be incurred in future periods. We had up to $20 million of back charges that may be disputed as of September 30, 2023, but none as of December 31, 2022. Remaining Unsatisfied Performance Obligations
We estimate that our RUPO will be satisfied over the following periods:
(in millions)September 30, 2023
Within 1 year$12,599 
1 to 2 years7,500 
Thereafter3,978 
Total RUPO$24,077