Securities Available for Sale (Tables)

9 Months Ended

Sep. 30, 2017

Investments, Debt and Equity Securities [Abstract]



	September 30, 2017
(Dollars in millions)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. Treasury securities		$4,300		$9		$48		$4,261
Federal agency securities	266		5		1		270
U.S. states and political subdivisions	558		9		4		563
MBS - agency	24,860		287		167		24,980
MBS - non-agency residential	59		4		1		62
MBS - non-agency commercial	747		6		3		750
ABS	6		2		—		8
Corporate and other debt securities	33		—		—		33
Other equity securities ¹	518		1		2		517
Total securities AFS		$31,347		$323		$226		$31,444

	December 31, 2016
(Dollars in millions)	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. Treasury securities		$5,486		$5		$86		$5,405
Federal agency securities	310		5		2		313
U.S. states and political subdivisions	279		5		5		279
MBS - agency	23,642		313		293		23,662
MBS - non-agency residential	71		3		—		74
MBS - non-agency commercial	257		—		5		252
ABS	8		2		—		10
Corporate and other debt securities	34		1		—		35
Other equity securities ¹	642		1		1		642
Total securities AFS		$30,729		$335		$392		$30,672

¹ At September 30, 2017, the fair value of other equity securities was comprised of the following: $68 million of FHLB of Atlanta stock, $403 million of Federal Reserve Bank of Atlanta stock, $41 million of mutual fund investments, and $5 million of other.

At December 31, 2016, the fair value of other equity securities was comprised of the following: $132 million of FHLB of Atlanta stock, $402 million of Federal Reserve Bank of Atlanta stock, $102 million of mutual fund investments, and $6 million of other.

Investment Income [Table Text Block]

The following table presents interest and dividends on securities AFS:



	Three Months Ended September 30				Nine Months Ended September 30
(Dollars in millions)	2017		2016		2017		2016
Taxable interest		$187		$154		$551		$470
Tax-exempt interest	4		2		9		4
Dividends	4		3		13		9
Total interest and dividends on securities AFS		$195		$159		$573		$483

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 debt securities AFS at September 30, 2017, 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		$—			$2,002			$2,298			$—			$4,300
Federal agency securities	126			46			4			90			266
U.S. states and political subdivisions	6			46			179			327			558
MBS - agency	1,475			9,092			13,785			508			24,860
MBS - non-agency residential	—			59			—			—			59
MBS - non-agency commercial	5			12			730			—			747
ABS	—			6			—			—			6
Corporate and other debt securities	23			10			—			—			33
Total debt securities AFS		$1,635			$11,273			$16,996			$925			$30,829
Fair Value:
U.S. Treasury securities		$—			$1,996			$2,265			$—			$4,261
Federal agency securities	129			47			4			90			270
U.S. states and political subdivisions	6			48			185			324			563
MBS - agency	1,544			9,199			13,730			507			24,980
MBS - non-agency residential	—			62			—			—			62
MBS - non-agency commercial	5			12			733			—			750
ABS	—			8			—			—			8
Corporate and other debt securities	23			10			—			—			33
Total debt securities AFS		$1,707			$11,382			$16,917			$921			$30,927
Weighted average yield ¹	3.51		%	2.35		%	2.67		%	3.15		%	2.62		%

¹Weighted average yields are based on amortized cost.

Securities in a Continuous Unrealized Loss Position

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



	September 30, 2017
	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		$1,092		$9		$1,382		$39		$2,474		$48
Federal agency securities	43		—		33		1		76		1
U.S. states and political subdivisions	178		1		119		3		297		4
MBS - agency	9,571		92		2,709		75		12,280		167
MBS - non-agency commercial	207		2		47		1		254		3
ABS	—		—		5		—		5		—
Corporate and other debt securities	10		—		—		—		10		—
Other equity securities	—		—		3		2		3		2
Total temporarily impaired securities AFS	11,101		104		4,298		121		15,399		225
OTTI securities AFS ¹:
MBS - non-agency residential	14		1		—		—		14		1
ABS	—		—		1		—		1		—
Total OTTI securities AFS	14		1		1		—		15		1
Total impaired securities AFS		$11,115		$105		$4,299		$121		$15,414		$226

¹OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.

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



	December 31, 2016
	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		$4,380		$86		$—		$—		$4,380		$86
Federal agency securities	96		2		3		—		99		2
U.S. states and political subdivisions	149		5		—		—		149		5
MBS - agency	14,622		285		451		8		15,073		293
MBS - non-agency commercial	184		5		—		—		184		5
ABS	—		—		5		—		5		—
Corporate and other debt securities	12		—		—		—		12		—
Other equity securities	—		—		4		1		4		1
Total temporarily impaired securities AFS	19,443		383		463		9		19,906		392
OTTI securities AFS ¹:
MBS - non-agency residential	16		—		—		—		16		—
ABS	—		—		1		—		1		—
Total OTTI securities AFS	16		—		1		—		17		—
Total impaired securities AFS		$19,459		$383		$464		$9		$19,923		$392

¹OTTI securities AFS are impaired securities for which OTTI credit losses have been previously recognized in earnings.

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

- 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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