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Receivables, Net (Tables)
3 Months Ended
Mar. 31, 2020
Receivables, Net  
Schedule of receivables

March 31,

December 31,

($ in millions)

2020

    

2019

Trade accounts receivable

$

865

$

647

Unbilled receivables

558

556

Less allowance for doubtful accounts

(6)

(17)

Net trade accounts receivable

1,417

1,186

Other receivables

445

445

$

1,862

$

1,631