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Receivables, Net (Tables)
3 Months Ended
Mar. 31, 2021
Receivables, Net  
Schedule of receivables

March 31,

December 31,

($ in millions)

2021

    

2020

Trade accounts receivable

$

1,012

$

825

Unbilled receivables

637

528

Less: Allowance for doubtful accounts

(9)

(9)

Net trade accounts receivable

1,640

1,344

Other receivables

475

394

$

2,115

$

1,738