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Receivables, Net (Tables)
9 Months Ended
Sep. 30, 2020
Receivables, Net  
Schedule of receivables

September 30,

December 31,

($ in millions)

2020

    

2019

Trade accounts receivable

$

925

$

647

Unbilled receivables

502

556

Less allowance for doubtful accounts

(9)

(17)

Net trade accounts receivable

1,418

1,186

Other receivables

354

445

$

1,772

$

1,631