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Receivables, Net (Tables)
6 Months Ended
Jun. 30, 2019
Receivables, Net  
Schedule of receivables

June 30,

December 31,

($ in millions)

    

2019

    

2018

Trade accounts receivable

$

1,017

$

812

Unbilled receivables

503

478

Less allowance for doubtful accounts

(9)

(10)

Net trade accounts receivable

1,511

1,280

Other receivables

445

522

$

1,956

$

1,802