Investment Securities (Tables)

6 Months Ended

Jun. 30, 2017

Jun. 30, 2016

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



	June 30, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	775	$	8	$	9	$	774
Available-for-sale
U.S. Treasury securities	25		—		—		25
U.S. Government agencies and corporations:
Agency securities	1,828		5		6		1,827
Agency guaranteed mortgage-backed securities	9,772		27		78		9,721
Small Business Administration loan-backed securities	2,361		20		10		2,371
Municipal securities	1,306		15		4		1,317
Other debt securities	25		—		—		25
	15,317		67		98		15,286
Money market mutual funds and other	55		—		—		55
	15,372		67		98		15,341
Total	$	16,147	$	75	$	107	$	16,115



	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



	June 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	$	108	$	108	$	1,990	$	1,983
Principal return after one year through five years	276		278		5,771		5,752
Principal return after five years through ten years	207		210		4,787		4,784
Principal return after ten years	184		178		2,769		2,767
	$	775	$	774	$	15,317	$	15,286

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



	June 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	$	3	$	241	$	6	$	132	$	9	$	373
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	5		928		1		122		6		1,050
Agency guaranteed mortgage-backed securities	71		5,693		7		391		78		6,084
Small Business Administration loan-backed securities	1		132		9		786		10		918
Municipal securities	4		466		—		15		4		481
Other	—		—		—		14		—		14
	81		7,219		17		1,328		98		8,547
Total	$	84	$	7,460	$	23	$	1,460	$	107	$	8,920



	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
	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						Six Months Ended
	June 30, 2017			June 30, 2016			June 30, 2017			June 30, 2016
(In millions)	Gross gains	Gross losses		Gross gains	Gross losses		Gross gains	Gross losses		Gross gains	Gross losses

Investment securities:
Other noninterest-bearing investments	4	2		3	—		14	7		6	4
Net gains ¹		$	2		$	3		$	7		$	2

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



(In millions)	Three Months Ended June 30, 2017						Six Months Ended June 30, 2017
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	2	$	3	$	5	$	5	$	7	$	12
Available-for-sale	71		7		78		137		12		149
Trading	1		—		1		1		—		1
	$	74	$	10	$	84	$	143	$	19	$	162



(In millions)	Three Months Ended June 30, 2016						Six Months Ended June 30, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	3	$	3	$	6	$	5	$	6	$	11
Available-for-sale	38		3		41		78		5		83
Trading	1		—		1		1		—		1
	$	42	$	6	$	48	$	84	$	11	$	95

- 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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