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Explanatory Note (Tables)
 12 Months Ended
Dec. 31, 2017
Explanatory Note [Abstract]  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
Reconciliation of Net Revenues and Net Income/(Loss)
 
Years Ended December 31,
(In millions)
2017
 
2016
 
2015
Net revenues
 
 
 
 
 
Previously reported
$
4,852

 
$
3,877

 
$
3,929

Adoption of new revenue recognition standard
16

 
—

 
28

As recast
$
4,868

 
$
3,877

 
$
3,957

 
 
 
 
 
 
Net income/(loss)
 
 
 
 
 
Previously reported
$
(382
)
 
$
(3,077
)
 
$
6,008

Adoption of new revenue recognition standard
7

 
(1
)
 
3

As recast
$
(375
)
 
$
(3,078
)
 
$
6,011