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Recent Accounting Pronouncements (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Standards Update 2014-09 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Schedule of changes related to adoption of new accounting pronouncement
The table below presents the expected effects upon adoption these changes in presentation would have had on our Cable Communications segment revenue, operating costs and expenses and depreciation and amortization expense in 2017 and 2016.
Year ended December 31 (in millions)
2017
2016
 
As Reported

Effects of
Adoption(a)

Upon
Adoption(a)

As Reported

Effects of
Adoption(a)

Upon
Adoption(a)

Cable Communications segment
 
 
 
 
 
 
Revenue
$
52,519

$
482

$
53,001

$
50,048

$
471

$
50,519

Operating costs and expenses
$
31,349

$
619

$
31,968

$
29,939

$
602

$
30,541

Depreciation and amortization expense
$
8,143

$
(137
)
$
8,006

$
7,670

$
(131
)
$
7,539

(a) Certain other immaterial changes in presentation and the impacts due to changes in timing of revenue recognition and related costs described below were excluded from the table. The final effects of the adoption will differ from the amounts presented above.