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Revenue Related to Contracts with Customers
 3 Months Ended
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Related to Contracts with Customers REVENUE RELATED TO CONTRACTS WITH CUSTOMERS
DISAGGREGATED REVENUE
We disaggregate our revenue from contracts with customers by primary geographic markets.
Three Months Ended March 31,
Total Revenue20212020
U.S.$1,052 $1,315 
Non-U.S.3,730 4,110 
Total$4,782 $5,425 
REMAINING PERFORMANCE OBLIGATIONS
As of March 31, 2021 and 2020, the aggregate amount of the transaction price allocated to the unsatisfied (or partially unsatisfied) performance obligations was $23.2 billion and $22.7 billion, respectively. As of March 31, 2021, we expect to recognize revenue of approximately 51%, 66% and 90% of the total remaining performance obligations within 2, 5, and 15 years, respectively, and the remaining thereafter. Contract modifications could affect both the timing to complete as well as the amount to be received as we fulfill the related remaining performance obligations.
PROGRESS COLLECTIONS AND DEFERRED INCOME
Contract liabilities include progress collections, which reflects billings in excess of revenue, and deferred income on our long-term contracts to construct technically complex equipment, long-term product maintenance or extended warranty arrangements. Contract liabilities are comprised of the following:
March 31, 2021December 31, 2020
Progress collections$3,288 $3,352 
Deferred income109 102 
Progress collections and deferred income (contract liabilities)$3,397 $3,454 
Revenue recognized during the three months ended March 31, 2021 and 2020 that was included in the contract liabilities at the beginning of the period was $878 million and $507 million, respectively.