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Derivative Instruments (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018
 
As of December 31, 2017
 
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
$
92,573

 
$
601

 
$
24,643

 
$
(878
)
 
$
52,732

 
$
772

 
$
70,211

 
$
(2,120
)
Receive-fixed
105,051

 
1,371

 
61,174

 
(1,254
)
 
31,671

 
2,391

 
138,852

 
(1,764
)
Basis
273

 
102

 
600

 
(1
)
 
873

 
124

 
—

 
—

Foreign currency
243

 
62

 
245

 
(43
)
 
234

 
59

 
236

 
(56
)
Swaptions:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pay-fixed
11,375

 
222

 
2,750

 
(5
)
 
9,750

 
95

 
4,000

 
(20
)
Receive-fixed
500

 
21

 
9,375

 
(317
)
 
250

 
13

 
9,250

 
(304
)
Other(1)
20,912

 
25

 
—

 
(1
)
 
13,240

 
22

 
7,315

 
(1
)
Total gross risk management derivatives
230,927

 
2,404

 
98,787

 
(2,499
)
 
108,750

 
3,476

 
229,864

 
(4,265
)
Accrued interest receivable (payable)
—

 
378

 
—

 
(521
)
 
—

 
835

 
—

 
(814
)
Netting adjustment(2)
—

 
(2,744
)
 
—

 
2,867

 
—

 
(4,272
)
 
—

 
4,979

Total net risk management derivatives
$
230,927

 
$
38

 
$
98,787

 
$
(153
)
 
$
108,750

 
$
39

 
$
229,864

 
$
(100
)
Mortgage commitment derivatives:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage commitments to purchase whole loans
5,490

 
18

 
575

 
(2
)
 
4,143

 
9

 
1,570

 
(2
)
Forward contracts to purchase mortgage-related securities
63,336

 
227

 
8,092

 
(40
)
 
45,925

 
108

 
21,099

 
(21
)
Forward contracts to sell mortgage-related securities
5,671

 
32

 
108,580

 
(468
)
 
19,320

 
15

 
85,556

 
(205
)
Total mortgage commitment derivatives
74,497

 
277

 
117,247

 
(510
)
 
69,388

 
132

 
108,225

 
(228
)
Derivatives at fair value
$
305,424

 
$
315

 
$
216,034

 
$
(663
)
 
$
178,138

 
$
171

 
$
338,089

 
$
(328
)
__________
(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 $755 million and $1.4 billion as of March 31, 2018 and December 31, 2017, respectively. Cash collateral received was $633 million and $649 million as of March 31, 2018 and December 31, 2017, 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
 
Ended March 31,
 
2018
 
2017
 
(Dollars in millions)
Risk management derivatives:
 
 
 
Swaps:
 
 
 
Pay-fixed
$
2,783

 
$
691

Receive-fixed
(2,387
)
 
(317
)
Basis
(23
)
 
7

Foreign currency
16

 
12

Swaptions:
 
 
 
Pay-fixed
129

 
—

Receive-fixed
(16
)
 
(18
)
Other
12

 
(8
)
Net accrual of periodic settlements
(215
)
 
(255
)
Total risk management derivatives fair value gains, net
299

 
112

Mortgage commitment derivatives fair value gains (losses), net
564

 
(80
)
Total derivatives fair value gains, net
$
863

 
$
32