Investment Securities (Tables)

9 Months Ended

Sep. 30, 2017

Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]



	September 30, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	746	$	7	$	10	$	743
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,839		5		4		1,840
Agency guaranteed mortgage-backed securities	9,748		21		86		9,683
Small Business Administration loan-backed securities	2,281		19		9		2,291
Municipal securities	1,281		15		5		1,291
Other debt securities	25		—		—		25
	15,199		60		104		15,155
Money market mutual funds and other	87		—		—		87
	15,286		60		104		15,242
Total	$	16,032	$	67	$	114	$	15,985



	December 31, 2016
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	868	$	5	$	23	$	850
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	1,846		2		9		1,839
Agency guaranteed mortgage-backed securities	7,986		7		110		7,883
Small Business Administration loan-backed securities	2,298		8		18		2,288
Municipal securities	1,182		1		29		1,154
Other debt securities	25		—		1		24
	13,337		18		167		13,188
Money market mutual funds and other	184		—		—		184
	13,521		18		167		13,372
Total	$	14,389	$	23	$	190	$	14,222

Contractual Maturities Debt Securities



	September 30, 2017
	Held-to-maturity				Available-for-sale
(In millions)	Amortized cost		Estimated fair value		Amortized cost		Estimated fair value

Principal return in one year or less	$	99	$	100	$	2,296	$	2,285
Principal return after one year through five years	282		284		5,406		5,384
Principal return after five years through ten years	186		188		4,784		4,779
Principal return after ten years	179		171		2,713		2,707
Total	$	746	$	743	$	15,199	$	15,155

Summary Of Amount Of Gross Unrealized Losses For Debt Securities And Estimated Fair Value



	September 30, 2017
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	1	$	175	$	9	$	132	$	10	$	307
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	3		576		1		331		4		907
Agency guaranteed mortgage-backed securities	74		6,266		12		677		86		6,943
Small Business Administration loan-backed securities	1		149		8		749		9		898
Municipal securities	3		321		2		122		5		443
Other	—		—		—		—		—		—
Available-for-sale total	81		7,312		23		1,879		104		9,191
Total	$	82	$	7,487	$	32	$	2,011	$	114	$	9,498



	December 31, 2016
	Less than 12 months				12 months or more				Total
(In millions)	Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	15	$	467	$	8	$	61	$	23	$	528
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	9		950		—		127		9		1,077
Agency guaranteed mortgage-backed securities	102		6,649		7		326		109		6,975
Small Business Administration loan-backed securities	3		527		16		841		19		1,368
Municipal securities	28		992		—		9		28		1,001
Other	—		—		2		14		2		14
Available-for-sale total	142		9,118		25		1,317		167		10,435
Total	$	157	$	9,585	$	33	$	1,378	$	190	$	10,963

Gains And Losses, Including OTTI, Recognized In Statement Of Income



	Three Months Ended								Nine Months Ended
	September 30, 2017				September 30, 2016				September 30, 2017				September 30, 2016
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses		Gross gains		Gross losses
Investment securities:
Other noninterest-bearing investments	$	5	$	—	$	8	$	—	$	20	$	7	$	15	$	4
Net gains ¹			$	5			$	8			$	13			$	11

Tax and Nontaxable Interest Income by Investment Type [Table Text Block]



(In millions)	Three Months Ended September 30, 2017						Nine Months Ended September 30, 2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	10	$	17
Available-for-sale	72		6		78		209		18		227
Trading	1		—		1		2		—		2
Total	$	75	$	9	$	84	$	218	$	28	$	246



(In millions)	Three Months Ended September 30, 2016						Nine Months Ended September 30, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	7	$	9	$	16
Available-for-sale	40		3		43		118		8		126
Trading	1		—		1		1		—		1
Total	$	43	$	6	$	49	$	126	$	17	$	143

- Definition

Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments.

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