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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions [Table Text Block]
The following table summarizes assets and liabilities from transactions with related party broker-dealers at:
 
December 31,
 
2017
 
2016
 
(In millions)
Fee income receivables
$
19

 
$
19

Secured demand notes
$
—

 
$
20

The following table summarizes assets and liabilities from transactions with related parties (excluding broker-dealer transactions) at:
 
December 31,
 
2017
 
2016
 
(In millions)
Assets
$
2,839

 
$
4,288

Liabilities
$
2,675

 
$
5,125

The following table summarizes income and expense from transactions with related party broker-dealers for the years indicated:
 
Years Ended December 31,
 
2017
 
2016
 
2015
 
(In millions)
Fee income
$
224

 
$
202

 
$
218

Commission expense
$
642

 
$
638

 
$
643

The following table summarizes income and expense from transactions with related parties (excluding broker-dealer transactions) for the years indicated:
 
Years Ended December 31,
 
2017
 
2016
 
2015
 
(In millions)
Income
$
(149
)
 
$
(45
)
 
$
36

Expense
$
933

 
$
370

 
$
855