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Accounts Receivable and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2016
Receivables [Abstract]  
Schedule Of Accounts Receivable and Other Current Assets
(in millions)
2016

2015

Trade accounts receivable
$
507

$
517

Unbilled accounts receivable
551

404

Allowance for doubtful accounts
(33
)
(66
)
Income tax receivable
26


Assets held for sale

38

Other
76

71

 
$
1,127

$
964