Securities Available for Sale (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]



	March 31, 2018
(Dollars in millions)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. Treasury securities		$4,437		$—		$97		$4,340
Federal agency securities	248		3		2		249
U.S. states and political subdivisions	644		5		13		636
MBS - agency residential	22,837		146		470		22,513
MBS - agency commercial	2,320		1		79		2,242
MBS - non-agency residential	53		4		—		57
MBS - non-agency commercial	897		—		23		874
ABS	6		1		—		7
Corporate and other debt securities	16		—		—		16
Total securities AFS		$31,458		$160		$684		$30,934

	December 31, 2017¹
(Dollars in millions)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. Treasury securities		$4,361		$2		$32		$4,331
Federal agency securities	257		3		1		259
U.S. states and political subdivisions	618		7		8		617
MBS - agency residential	22,616		222		134		22,704
MBS - agency commercial	2,121		3		38		2,086
MBS - non-agency residential	55		4		—		59
MBS - non-agency commercial	862		7		3		866
ABS	6		2		—		8
Corporate and other debt securities	17		—		—		17
Total securities AFS		$30,913		$250		$216		$30,947

¹Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets. Reclassifications have been made to previously reported amounts for comparability. See Note 9, "Other Assets," for additional information.

Investment Income [Table Text Block]

The following table presents interest on securities AFS:



	Three Months Ended March 31
(Dollars in millions)	2018		2017
Taxable interest		$201		$180
Tax-exempt interest	5		2
Total interest on securities AFS ¹		$206		$182

¹Beginning January 1, 2018, the Company reclassified equity securities previously presented in Securities available for sale to Other assets on the Consolidated Balance Sheets and began presenting income associated with certain of these equity securities in Trading account interest and other on the Consolidated Statements of Income. For periods prior to January 1, 2018, income associated with these equity securities was presented in Interest on securities available for sale and has been reclassified to Trading account interest and other for comparability.

Amortized Cost and Fair Value of Investments in Debt Securities by Estimated Average Life

The following table presents the amortized cost, fair value, and weighted average yield of investments in securities AFS at March 31, 2018, by remaining contractual maturity, with the exception of MBS and ABS, which are based on estimated average life. Receipt of cash flows may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without penalties.



	Distribution of Remaining Maturities
(Dollars in millions)	Due in 1 Year or Less			Due After 1 Year through 5 Years			Due After 5 Years through 10 Years			Due After 10 Years			Total
Amortized Cost:
U.S. Treasury securities		$—			$2,731			$1,706			$—			$4,437
Federal agency securities	116			40			4			88			248
U.S. states and political subdivisions	6			59			63			516			644
MBS - agency residential	1,462			4,771			16,222			382			22,837
MBS - agency commercial	1			414			1,643			262			2,320
MBS - non-agency residential	—			49			—			4			53
MBS - non-agency commercial	—			13			884			—			897
ABS	—			—			5			1			6
Corporate and other debt securities	7			9			—			—			16
Total securities AFS		$1,592			$8,086			$20,527			$1,253			$31,458
Fair Value:
U.S. Treasury securities		$—			$2,673			$1,667			$—			$4,340
Federal agency securities	118			41			4			86			249
U.S. states and political subdivisions	6			61			65			504			636
MBS - agency residential	1,517			4,747			15,877			372			22,513
MBS - agency commercial	1			400			1,589			252			2,242
MBS - non-agency residential	—			53			—			4			57
MBS - non-agency commercial	—			12			862			—			874
ABS	—			—			6			1			7
Corporate and other debt securities	7			9			—			—			16
Total securities AFS		$1,649			$7,996			$20,070			$1,219			$30,934
Weighted average yield ¹	3.31		%	2.18		%	2.86		%	3.04		%	2.72		%

¹Weighted average yields are based on amortized cost and presented on an FTE basis.

Securities in a Continuous Unrealized Loss Position

Securities AFS in an unrealized loss position at period end are presented in the following tables:



	March 31, 2018
	Less than twelve months				Twelve months or longer				Total
(Dollars in millions)	Fair Value		Unrealized Losses ¹		Fair Value		Unrealized Losses ¹		Fair Value		Unrealized Losses ¹
Temporarily impaired securities AFS:
U.S. Treasury securities		$3,508		$69		$832		$28		$4,340		$97
Federal agency securities	22		—		53		2		75		2
U.S. states and political subdivisions	384		8		110		5		494		13
MBS - agency residential	13,742		284		4,460		186		18,202		470
MBS - agency commercial	1,260		33		894		46		2,154		79
MBS - non-agency commercial	748		18		90		5		838		23
ABS	—		—		4		—		4		—
Corporate and other debt securities	9		—		—		—		9		—
Total temporarily impaired securities AFS	19,673		412		6,443		272		26,116		684
OTTI securities AFS ²:
ABS	—		—		1		—		1		—
Total OTTI securities AFS	—		—		1		—		1		—
Total impaired securities AFS		$19,673		$412		$6,444		$272		$26,117		$684

¹ Unrealized losses less than $0.5 million are presented as zero within the table.

² OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.



	December 31, 2017 ¹
	Less than twelve months				Twelve months or longer				Total
(Dollars in millions)	Fair Value		Unrealized Losses ²		Fair Value		Unrealized Losses ²		Fair Value		Unrealized Losses ²
Temporarily impaired securities AFS:
U.S. Treasury securities		$1,993		$12		$841		$20		$2,834		$32
Federal agency securities	23		—		60		1		83		1
U.S. states and political subdivisions	267		3		114		5		381		8
MBS - agency residential	8,095		38		4,708		96		12,803		134
MBS - agency commercial	887		9		915		29		1,802		38
MBS - non-agency commercial	134		1		93		2		227		3
ABS	—		—		4		—		4		—
Corporate and other debt securities	10		—		—		—		10		—
Total temporarily impaired securities AFS	11,409		63		6,735		153		18,144		216
OTTI securities AFS ³:
ABS	—		—		1		—		1		—
Total OTTI securities AFS	—		—		1		—		1		—
Total impaired securities AFS		$11,409		$63		$6,736		$153		$18,145		$216

² Unrealized losses less than $0.5 million are presented as zero within the table.

³ OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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