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Accounting Pronouncements Schedule of new accounting pronouncements and changes (Tables)
 9 Months Ended
Sep. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Restatement to Prior Year Income [Table Text Block]
See Note 9 to the Consolidated Financial Statements. The retrospective impact of the adoption is shown in the table below (in millions):
 
 
Three Months Ended September 30, 2017
 
 
As Previously Reported
 
Adjustments
 
As Revised
Operating expenses
 
$
3,361

 
$
13

 
$
3,374

Operating income
 
$
1,953

 
$
(13
)
 
$
1,940

Other (income) expense, net
 
$
(10
)
 
$
(13
)
 
$
(23
)


 
 
Nine Months Ended September 30, 2017
 
 
As Previously Reported
 
Adjustments
 
As Revised
Operating expenses
 
$
10,415

 
$
40

 
$
10,455

Operating income
 
$
5,334

 
$
(40
)
 
$
5,294

Other (income) expense, net
 
$
(19
)
 
$
(40
)
 
$
(59
)