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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes changes to accumulated OCI for fiscal years 2017, 2016 and 2015 (in millions):
Accumulated Other Comprehensive Income (Loss)
 
Net Unrealized Gain (Loss) on Available-for-Sale MBS
 
Net Unrealized Gain (Loss) on Swaps
 
Total Accumulated
OCI
Balance
Balance as of December 31, 2014
 
$
570

 
$
(140
)
 
$
430

OCI before reclassifications
 
(620
)
 
—

 
(620
)
Amounts reclassified from accumulated OCI
 
23

 
101

 
124

Balance as of December 31, 2015
 
$
(27
)
 
$
(39
)
 
$
(66
)
OCI before reclassifications
 
(261
)
 
—

 
(261
)
Amounts reclassified from accumulated OCI
 
(109
)
 
39

 
(70
)
Balance as of December 31, 2016
 
$
(397
)
 
$
—

 
$
(397
)
OCI before reclassifications
 
(31
)
 
—

 
(31
)
Amounts reclassified from accumulated OCI
 
83

 
—

 
83

Balance as of December 31, 2017
 
$
(345
)
 
$
—

 
$
(345
)
The following table summarizes reclassifications out of accumulated OCI for fiscal years 2017, 2016 and 2015 (in millions):
 
 
Fiscal Year
 
Line Item in the Consolidated
Statements of Comprehensive Income
Where Net Income is Presented
Amounts Reclassified from Accumulated OCI
 
2017
 
2016
 
2015
 
(Gain) loss amounts reclassified from accumulated OCI for available-for-sale MBS upon realization
 
$
83

 
$
(109
)
 
$
23

 
Realized gain (loss) on sale of investment securities, net
Periodic interest costs of interest rate swaps previously designated as hedges under GAAP, net
 
—

 
39

 
101

 
Interest expense
     Total reclassifications
 
$
83

 
$
(70
)
 
$
124