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Investments in Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments In Trading Securities [Table Text Block] The following table displays our investments in trading securities.
 
As of
 
September 30, 2018
 
December 31, 2017
 
(Dollars in millions)
 
Mortgage-related securities:
 
 
 
 
 
 
 
Fannie Mae(1)
 
$
1,469

 
 
 
$
3,876

 
Other agency
 
3,642

 
 
 
1,118

 
Alt-A and subprime private-label securities(1)
 
1,367

 
 
 
453

 
Commercial mortgage-backed securities (“CMBS”)
 
—

 
 
 
9

 
Mortgage revenue bonds
 
1

 
 
 
1

 
Total mortgage-related securities
 
6,479

 
 
 
5,457

 
Non-mortgage-related securities:
 
 
 
 
 
 
 
U.S. Treasury securities
 
37,328

 
 
 
29,222

 
Other securities
 
94

 
 
 
—

 
Total non-mortgage-related securities
 
37,422

 
 
 
29,222

 
Total trading securities
 
$
43,901

 
 
 
$
34,679

 
__________
(1) 
The increase in Alt-A and subprime private-label securities from December 31, 2017 to September 30, 2018 was due to the dissolution in the first quarter of 2018 of a Fannie Mae-wrapped private-label securities trust. The Fannie Mae-wrapped private-label securities had been classified as Fannie Mae mortgage-related securities prior to the dissolution.
Schedule of Trading Securities Gains (Losses), Net [Table Text Block] The following table displays information about our net trading gains (losses).
 
For the Three Months Ended September 30,
 
For the Nine Months Ended September 30,
 
 
 
2018
 
2017
 
2018
 
2017
 
(Dollars in millions)
Net trading gains (losses)
$
(40
)
 
$
59

 
$
79

 
$
145

Net trading gains (losses) recognized in the period related to securities still held at period end
(27
)
 
51

 
20

 
125
Schedule of Realized Gain (Loss) [Table Text Block] The following table displays the gross realized gains and proceeds on sales of AFS securities.
 
For the Three Months
 
For the Nine Months
 
Ended September 30,
 
Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
(Dollars in millions)
Gross realized gains
$
12

 
$
30

 
$
375

 
$
260

Total proceeds (excludes initial sale of securities from new portfolio securitizations)
21

 
187

 
662

 
1,081
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] The following tables display the amortized cost, gross unrealized gains and losses, and fair value by major security type for AFS securities.
 
As of September 30, 2018
 
Total Amortized Cost(1)
 
Gross Unrealized Gains
 
Gross Unrealized Losses(2)
 
Total Fair Value
 
(Dollars in millions)
Fannie Mae
 
$
1,808

 
 
 
$
58

 
 
 
$
(38
)
 
 
$
1,828

Other agency
 
256

 
 
 
16

 
 
 
—

 
 
272

Alt-A and subprime private-label securities
 
337

 
 
 
280

 
 
 
—

 
 
617

Mortgage revenue bonds
 
454

 
 
 
15

 
 
 
(5
)
 
 
464

Other mortgage-related securities
 
339

 
 
 
17

 
 
 
—

 
 
356

Total
 
$
3,194

 
 
 
$
386

 
 
 
$
(43
)
 
 
$
3,537

 
As of December 31, 2017
 
Total Amortized Cost(1)
 
Gross Unrealized Gains
 
Gross Unrealized Losses(2)
 
Total Fair Value
 
(Dollars in millions)
Fannie Mae
 
$
2,044

 
 
 
$
102

 
 
 
$
(27
)
 
 
$
2,119

Other agency
 
332

 
 
 
25

 
 
 
—

 
 
357

Alt-A and subprime private-label securities
 
662

 
 
 
652

 
 
 
—

 
 
1,314

CMBS
 
15

 
 
 
—

 
 
 
—

 
 
15

Mortgage revenue bonds
 
655

 
 
 
20

 
 
 
(4
)
 
 
671

Other mortgage-related securities
 
350

 
 
 
17

 
 
 
—

 
 
367

Total
 
$
4,058

 
 
 
$
816

 
 
 
$
(31
)
 
 
$
4,843

__________
(1) 
Amortized cost consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, as well as net other-than-temporary impairments (“OTTI”) recognized in “Investment gains, net” in our condensed consolidated statements of operations and comprehensive income.
(2) 
Represents the gross unrealized losses on securities for which we have not recognized OTTI, as well as the noncredit component of OTTI and cumulative changes in fair value of securities for which we previously recognized the credit component of OTTI in “Accumulated other comprehensive income” in our condensed consolidated balance sheets.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] The following tables display additional information regarding gross unrealized losses and fair value by major security type for AFS securities in an unrealized loss position.
 
As of September 30, 2018
 
Less Than 12 Consecutive Months
 
12 Consecutive Months or Longer
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
(Dollars in millions)
Fannie Mae
 
$
(3
)
 
 
$
208

 
 
$
(35
)
 
 
$
472

Mortgage revenue bonds
 
(2
)
 
 
42

 
 
(3
)
 
 
3

Total
 
$
(5
)
 
 
$
250

 
 
$
(38
)
 
 
$
475

 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2017
 
Less Than 12 Consecutive Months
 
12 Consecutive Months or Longer
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
(Dollars in millions)
Fannie Mae
 
$
(1
)
 
 
$
134

 
 
$
(26
)
 
 
$
461

Mortgage revenue bonds
 
—

 
 
—

 
 
(4
)
 
 
3

Total
 
$
(1
)
 
 
$
134

 
 
$
(30
)
 
 
$
464
Investments Classified by Contractual Maturity Date [Table Text Block] The following table displays the amortized cost and fair value of our AFS securities by major security type and remaining contractual maturity, assuming no principal prepayments. The contractual maturity of mortgage-backed securities is not a reliable indicator of their expected life because borrowers generally have the right to prepay their obligations at any time.
 
As of September 30, 2018
 
Total Amortized Cost
 
Total
Fair
Value
 
One Year or Less
 
After One Year Through Five Years
 
After Five Years Through Ten Years
 
After Ten Years
 
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
(Dollars in millions)
Fannie Mae
 
$
1,808

 
 
$
1,828

 
 
$
—

 
 
$
—

 
 
$
13

 
 
$
13

 
 
$
77

 
 
$
81

 
 
$
1,718

 
 
$
1,734

Other agency
 
256

 
 
272

 
 
2

 
 
1

 
 
9

 
 
10

 
 
42

 
 
45

 
 
203

 
 
216

Alt-A and subprime private-label securities
 
337

 
 
617

 
 
—

 
 
—

 
 
—

 
 
—

 
 
—

 
 
—

 
 
337

 
 
617

Mortgage revenue bonds
 
454

 
 
464

 
 
3

 
 
4

 
 
33

 
 
33

 
 
61

 
 
62

 
 
357

 
 
365

Other mortgage-related securities
 
339

 
 
356

 
 
—

 
 
—

 
 
—

 
 
—

 
 
7

 
 
6

 
 
332

 
 
350

Total
 
$
3,194

 
 
$
3,537

 
 
$
5

 
 
$
5

 
 
$
55

 
 
$
56

 
 
$
187

 
 
$
194

 
 
$
2,947

 
 
$
3,282