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Receivables, Net (Tables)
12 Months Ended
Dec. 31, 2019
Receivables, Net  
Schedule of receivables

December 31,

December 31,

($ in millions)

2019

    

2018

Trade accounts receivable

$

647

$

812

Unbilled receivables

556

478

Less allowance for doubtful accounts

(17)

(10)

Net trade accounts receivable

1,186

1,280

Other receivables

445

522

$

1,631

$

1,802