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Receivables, Net (Tables)
12 Months Ended
Dec. 31, 2021
Receivables, Net  
Schedule of receivables

December 31,

($ in millions)

2021

    

2020

Trade accounts receivable

$

1,304

$

825

Unbilled receivables

727

528

Less: Allowance for doubtful accounts

(9)

(9)

Net trade accounts receivable

2,022

1,344

Other receivables

538

394

$

2,560

$

1,738