Repurchase Agreements and Other Secured Borrowings

We pledge certain of our securities as collateral under our repurchase agreements with financial institutions and under our secured borrowing facility with the Federal Home Loan Bank ("FHLB") of Des Moines. Interest rates on our borrowings are generally based on LIBOR plus or minus a margin and amounts available to be borrowed are dependent upon the fair value of the securities pledged as collateral, which fluctuates with changes in interest rates, type of security and liquidity conditions within the banking, mortgage finance and real estate industries. If the fair value of our pledged securities declines, lenders will typically require us to post additional collateral or pay down borrowings to re-establish agreed upon collateral requirements, referred to as "margin calls." Similarly, if the fair value of our pledged securities increases, lenders may release collateral back to us. As of March 31, 2016, we had met all margin call requirements. For additional information regarding our pledged assets, please refer to Note 7.

Repurchase Agreements

As of March 31, 2016 and December 31, 2015, we had $45.3 billion and $41.8 billion, respectively, of repurchase agreements outstanding. The terms and conditions of our repurchase agreements are typically negotiated on a transaction-by-transaction basis. Our repurchase agreements with original maturities greater than 90 days have floating interest rates based on an index plus or minus a fixed spread. As of March 31, 2016, all of our repurchase agreements and, as of December 31, 2015, $41.7 billion of our repurchase agreements, were used to fund purchases of agency securities ("agency repo"), with an average borrowing rate of 0.76% and 0.61%, respectively, and a weighted average remaining term to maturity of 184 and 173 days, respectively. The remainder, or $25 million, of our repurchase agreements as of December 31, 2015, were used to fund temporary holdings of U.S. Treasury securities ("U.S. Treasury repo").

The following table summarizes our borrowings under repurchase arrangements and weighted average interest rates classified by remaining maturities as of March 31, 2016 and December 31, 2015 (dollars in millions):



	March 31, 2016					December 31, 2015
Remaining Maturity	Repurchase Agreements		Weighted Average Interest Rate		Weighted Average Days to Maturity	Repurchase Agreements		Weighted Average Interest Rate		Weighted Average Days to Maturity
Agency repo:
≤ 1 month	$	24,531	0.68	%	12	$	17,579	0.54	%	14
> 1 to ≤ 3 months	8,941		0.70	%	49	14,283		0.64	%	58
> 3 to ≤ 6 months	2,158		0.83	%	122	3,154		0.61	%	121
> 6 to ≤ 9 months	920		0.83	%	222	589		0.65	%	199
> 9 to ≤ 12 months	2,497		0.92	%	315	1,201		0.65	%	307
> 12 to ≤ 24 months	2,154		0.95	%	537	1,473		0.73	%	600
> 24 to ≤ 36 months	1,150		1.04	%	902	650		0.81	%	901
> 36 to ≤ 48 months	2,300		1.07	%	1,326	1,300		0.86	%	1,231
> 48 to < 60 months	625		1.10	%	1,781	1,500		0.76	%	1,477
Total agency repo	45,276		0.76	%	184	41,729		0.61	%	173
U.S. Treasury repo:
1 day	—		—	%	—	25		—	%	1
Total	$	45,276	0.76	%	184	$	41,754	0.61	%	173

Federal Home Loan Bank Advances

On January 12, 2016, the Federal Housing Finance Agency ("FHFA") released its final rule on FHLB membership, which requires the termination of our wholly-owned captive insurance subsidiary's FHLB membership and repayment of all FHLB advances after a one year period ending in February 2017. As of March 31, 2016 and December 31, 2015, we had $3.0 billion and $3.8 billion, respectively, of outstanding secured FHLB advances, with a weighted average borrowing rate of 0.56% and 0.53%, respectively, and a weighted average remaining term to maturity of 306 and 141 days, respectively, through February 2017, consisting of 30 day and longer-term floating rate advances:



	March 31, 2016					December 31, 2015
Remaining Maturity	FHLB Advances		Weighted Average Interest Rate		Weighted Average Days to Maturity	FHLB Advances		Weighted Average Interest Rate		Weighted Average Days to Maturity
≤ 1 month	$	—	—	%	—	$	1,952	0.47	%	14
> 1 to ≤ 3 months	—		—	%	—	681		0.60	%	84
> 9 to ≤ 12 months	3,037		0.56	%	306	—		—	%	—
13 months	—		—	%	—	1,120		0.58	%	397
Total FHLB advances	$	3,037	0.56	%	306	$	3,753	0.53	%	141

Debt of Consolidated Variable Interest Entities

As of March 31, 2016 and December 31, 2015, debt of consolidated VIEs, at fair value, was $562 million and $595 million, respectively, and had a weighted average interest rate of LIBOR plus 38 and 34 basis points, respectively, and a principal balance of $556 million and $587 million, respectively. The actual maturities of our debt of consolidated VIEs are generally shorter than the stated contractual maturities. The actual maturities are affected by the contractual lives of the underlying agency MBS securitizing the debt of our consolidated VIEs and periodic principal prepayments of such underlying securities. The estimated weighted average life of the debt of our consolidated VIEs as of March 31, 2016 and December 31, 2015 was 4.5 and 4.9 years, respectively.

TBA Dollar Roll Financing Transactions

As of March 31, 2016 and December 31, 2015, we had outstanding forward commitments to purchase and sell agency securities through the TBA market at a cost of $6.0 billion and $7.4 billion, respectively (see Notes 3 and 6). These transactions, also referred to as "TBA dollar roll transactions," represent a form of "off-balance sheet" financing and serve to either increase, in the case of forward purchases, or decrease, in the case of forward sales, our total "at risk" leverage. We account for such transactions as one or more series of derivative transactions and report our outstanding TBA commitments at their net carrying value of $41 million and $14 million as of March 31, 2016 and December 31, 2015, respectively, in derivative assets/(liabilities) on our accompanying consolidated balance sheets.