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Remaining Unsatisfied Performance Obligations
12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Remaining Unsatisfied Performance Obligations Contract Assets and LiabilitiesThe following summarizes information about our contract assets and liabilities:
December 31,
(in millions)20202019
Information about contract assets:
Contract assets
Unbilled receivables$681 $851 
Contract work in progress287 387 
Contract assets$968 $1,238 
Advance billings deducted from contract assets$310 $574 
Year Ended December 31,
20202019
Information about contract liabilities:
Provision for anticipated losses on contracts included in contract liabilities$203 $371 
Revenue recognized that was included in contract liabilities as of January 1755 779 
    Remaining Unsatisfied Performance Obligations
    We estimate that our RUPO will be satisfied over the following periods:
(in millions)December 31, 2020
Within 1 year$10,873 
1 to 2 years6,150 
Thereafter6,445 
Total remaining unsatisfied performance obligations$23,468