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Receivables, Net (Tables)
6 Months Ended
Jun. 30, 2020
Receivables, Net  
Schedule of receivables

June 30,

December 31,

($ in millions)

2020

    

2019

Trade accounts receivable

$

915

$

647

Unbilled receivables

541

556

Less allowance for doubtful accounts

(9)

(17)

Net trade accounts receivable

1,447

1,186

Other receivables

363

445

$

1,810

$

1,631