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Derivative Instruments (Tables)
 9 Months Ended
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Notional and Fair Value Position [Table Text Block]
The following table displays the notional amount and estimated fair value of our asset and liability derivative instruments.
 
As of September 30, 2017
 
As of December 31, 2016
 
Asset Derivatives
 
Liability Derivatives
 
Asset Derivatives
 
Liability Derivatives
 
Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value
 
Notional Amount
 
Estimated Fair Value
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Swaps:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
$
40,400

 
$
472

 
$
75,647

 
$
(2,639
)
 
$
29,540

 
$
660

 
$
94,584

 
$
(4,396
)
Receive-fixed
46,989

 
2,554

 
124,153

 
(1,109
)
 
30,207

 
2,696

 
135,470

 
(1,552
)
Basis
6,524

 
129

 
600

 
—

 
1,624

 
115

 
15,600

 
(11
)
Foreign currency
232

 
54

 
234

 
(64
)
 
214

 
40

 
216

 
(85
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
10,250

 
141

 
2,750

 
(4
)
 
9,600

 
241

 
4,850

 
(82
)
Receive-fixed
400

 
—

 
8,350

 
(280
)
 
—

 
—

 
10,100

 
(257
)
Other(1)
24,324

 
23

 
—

 
(1
)
 
15,087

 
33

 
655

 
(2
)
Total gross risk management derivatives
129,119

 
3,373

 
211,734

 
(4,097
)
 
86,272

 
3,785

 
261,475

 
(6,385
)
Accrued interest receivable (payable)
—

 
724

 
—

 
(907
)
 
—

 
785

 
—

 
(937
)
Netting adjustment(2)
—

 
(4,034
)
 
—

 
4,877

 
—

 
(4,514
)
 
—

 
6,844

Total net risk management derivatives
$
129,119

 
$
63

 
$
211,734

 
$
(127
)
 
$
86,272

 
$
56

 
$
261,475

 
$
(478
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
$
1,227

 
$
2

 
$
6,808

 
$
(18
)
 
$
4,753

 
$
28

 
$
3,039

 
$
(49
)
Forward contracts to purchase mortgage-related securities
16,572

 
38

 
55,847

 
(137
)
 
31,635

 
198

 
27,297

 
(388
)
Forward contracts to sell mortgage-related securities
77,781

 
181

 
35,790

 
(55
)
 
34,103

 
405

 
47,645

 
(300
)
Total mortgage commitment derivatives
$
95,580

 
$
221

 
$
98,445

 
$
(210
)
 
$
70,491

 
$
631

 
$
77,981

 
$
(737
)
Derivatives at fair value
$
224,699

 
$
284

 
$
310,179

 
$
(337
)
 
$
156,763

 
$
687

 
$
339,456

 
$
(1,215
)
__________
(1) 
Includes credit risk transfer transactions, futures, swap credit enhancements and mortgage insurance contracts that we account for as derivatives.
(2) 
The netting adjustment represents the effect of the legal right to offset under legally enforceable master netting arrangements to settle with the same counterparty on a net basis, including cash collateral posted and received. Cash collateral posted was $1.5 billion and $2.9 billion as of September 30, 2017 and December 31, 2016, respectively. Cash collateral received was $690 million and $535 million as of September 30, 2017 and December 31, 2016, respectively.
Fair Value Gain (Loss), Net [Table Text Block]
The following table displays, by type of derivative instrument, the fair value gains and losses, net on our derivatives.
 
For the Three Months
 
For the Nine Months
 
Ended September 30,
 
Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in millions)
Risk management derivatives:
 
 
 
 
 
 
 
Swaps:
 
 
 
 
 
 
 
Pay-fixed
$
300

 
$
1,386

 
$
300

 
$
(6,044
)
Receive-fixed
(202
)
 
(1,020
)
 
120

 
3,338

Basis
1

 
2

 
24

 
51

Foreign currency
13

 
(6
)
 
36

 
(37
)
Swaptions:
 
 
 
 
 
 
 
Pay-fixed
(40
)
 
(3
)
 
(88
)
 
26

Receive-fixed
(8
)
 
10

 
(34
)
 
(126
)
Other
11

 
(7
)
 
6

 
153

Net accrual of periodic settlements
(223
)
 
(295
)
 
(702
)
 
(855
)
Total risk management derivatives fair value gains (losses), net
$
(148
)
 
$
67

 
$
(338
)
 
$
(3,494
)
Mortgage commitment derivatives fair value losses, net
(248
)
 
(216
)
 
(520
)
 
(945
)
Total derivatives fair value losses, net
$
(396
)
 
$
(149
)
 
$
(858
)
 
$
(4,439
)