Securities (Tables)

12 Months Ended

Dec. 31, 2014

Securities

Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Available for Sale

			Amortized		Gross Unrealized				Fair
December 31, 2014			Cost		Gains		Losses		Value
			(Dollars in millions)
AFS securities:
	U.S. Treasury		$	1,230	$	1	$	—	$	1,231
	MBS issued by GSE			16,358		93		297		16,154
	States and political subdivisions			1,913		120		59		1,974
	Non-agency MBS			232		32		—		264
	Other			41		—		—		41
	Securities acquired from FDIC			886		357		—		1,243
		Total AFS securities	$	20,660	$	603	$	356	$	20,907

			Amortized		Gross Unrealized				Fair
December 31, 2013			Cost		Gains		Losses		Value
			(Dollars in millions)
AFS securities:
	U.S. Treasury		$	595	$	—	$	—	$	595
	MBS issued by GSE			18,397		78		546		17,929
	States and political subdivisions			1,877		65		91		1,851
	Non-agency MBS			264		27		—		291
	Other			46		—		1		45
	Securities acquired from FDIC			989		404		—		1,393
		Total AFS securities	$	22,168	$	574	$	638	$	22,104

Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Held to Maturity

			Amortized		Gross Unrealized				Fair
December 31, 2014			Cost		Gains		Losses		Value
			(Dollars in millions)
HTM securities:
	U.S. Treasury securities		$	1,096	$	23	$	—	$	1,119
	GSE securities			5,394		17		108		5,303
	Mortgage-backed securities issued by GSE			13,120		137		12		13,245
	States and political subdivisions			22		2		—		24
	Other securities			608		14		—		622
		Total HTM securities	$	20,240	$	193	$	120	$	20,313

			Amortized		Gross Unrealized				Fair
December 31, 2013			Cost		Gains		Losses		Value
			(Dollars in millions)
HTM securities:
	U.S. Treasury securities		$	392	$	—	$	8	$	384
	GSE securities			5,603		2		397		5,208
	Mortgage-backed securities issued by GSE			11,636		38		220		11,454
	States and political subdivisions			33		2		—		35
	Other securities			437		12		—		449
		Total HTM securities	$	18,101	$	54	$	625	$	17,530

Schedule of Credit Losses on Securities with OTTI, Excluding Securities Acquired from the FDIC, Where a Portion of the Unrealized Loss was Recognized in OCI

		Year Ended December 31,
		2014		2013		2012
		(Dollars in millions)
Balance at beginning of period		$	78	$	98	$	130
	Credit losses on securities without previous OTTI		6		―		―
	Credit losses on securities for which OTTI was previously recognized		―		―		5
	Reductions for securities sold/settled during the period		(17)		(20)		(37)
	Credit recoveries through yield		(3)		―		―
Balance at end of period		$	64	$	78	$	98

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity

		AFS				HTM
		Amortized		Fair		Amortized		Fair
December 31, 2014		Cost		Value		Cost		Value
		(Dollars in millions)
Due in one year or less		$	612	$	612	$	―	$	―
Due after one year through five years			828		839		750		734
Due after five years through ten years			583		611		6,007		5,960
Due after ten years			18,637		18,845		13,483		13,619
	Total debt securities	$	20,660	$	20,907	$	20,240	$	20,313

Gross Unrealized Losses and Fair Values of Investments by Investment Category and Length of Time in Unrealized Loss Position

			Less than 12 months				12 months or more				Total
			Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2014			Value		Losses		Value		Losses		Value		Losses
			(Dollars in millions)
AFS securities:
	MBS issued by GSE		$	2,285	$	19	$	6,878	$	278	$	9,163	$	297
	States and political subdivisions			13		—		449		59		462		59
		Total	$	2,298	$	19	$	7,327	$	337	$	9,625	$	356

HTM securities:
	GSE		$	896	$	5	$	3,968	$	103	$	4,864	$	108
	MBS issued by GSE			1,329		5		800		7		2,129		12
		Total	$	2,225	$	10	$	4,768	$	110	$	6,993	$	120

			Less than 12 months				12 months or more				Total
			Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2013			Value		Losses		Value		Losses		Value		Losses
			(Dollars in millions)
AFS securities:
	MBS issued by GSE		$	10,259	$	406	$	1,935	$	140	$	12,194	$	546
	States and political subdivisions			232		8		441		83		673		91
	Securities acquired from FDIC			34		1		―		―		34		1
		Total	$	10,525	$	415	$	2,376	$	223	$	12,901	$	638

HTM securities:
	U.S. Treasury		$	384	$	8	$	―	$	―	$	384	$	8
	GSE			4,996		397		―		―		4,996		397
	MBS issued by GSE			8,800		219		48		1		8,848		220
		Total	$	14,180	$	624	$	48	$	1	$	14,228	$	625