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Trade Accounts Receivable, Unbilled Services and Unearned Income (Tables)
 6 Months Ended
Jun. 30, 2022
Receivables [Abstract]  
Schedule of Trade Accounts Receivable and Unbilled Services Trade accounts receivables and unbilled services consist of the following:
(in millions)June 30, 2022December 31, 2021
Billed$1,261 $1,275 
Unbilled services1,446 1,309 
Trade accounts receivable and unbilled services2,707 2,584 
Allowance for doubtful accounts(28)(33)
Trade accounts receivable and unbilled services, net$2,679 $2,551 
Schedule of Net Contract Assets (Liabilities) Unbilled services and unearned income were as follows:
(in millions)June 30, 2022December 31, 2021
Change
Unbilled services$1,446 $1,309 $137 
Unearned income(1,810)(1,825)15 
Net balance$(364)$(516)$152