Investment Securities (Tables)

3 Months Ended

Mar. 31, 2017

Mar. 31, 2016

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



	March 31, 2017
(In millions)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Estimated fair value
Held-to-maturity
Municipal securities	$	815	$	7	$	19	$	803
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	1,858		3		8		1,853
Agency guaranteed mortgage-backed securities	10,060		12		111		9,961
SBA loan-backed securities	2,360		8		19		2,349
Municipal securities	1,299		4		18		1,285
Other debt securities	25		—		1		24
	15,602		27		157		15,472
Money market mutual funds and other	134		—		—		134
	15,736		27		157		15,606
Total	$	16,551	$	34	$	176	$	16,409



	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
SBA 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



	March 31, 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	$	142	$	142	$	1,884	$	1,868
Principal return after one year through five years	273		274		5,875		5,828
Principal return after five years through ten years	196		196		4,904		4,860
Principal return after ten years	204		191		2,939		2,916
	$	815	$	803	$	15,602	$	15,472

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



	March 31, 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	$	10	$	309	$	9	$	128	$	19	$	437
Available-for-sale
U.S. Government agencies and corporations:
Agency securities	7		1,297		1		124		8		1,421
Agency guaranteed mortgage-backed securities	103		7,220		8		440		111		7,660
Small Business Administration loan-backed securities	4		547		15		798		19		1,345
Municipal securities	17		811		1		14		18		825
Other	—		—		1		13		1		13
	131		9,875		26		1,389		157		11,264
Total	$	141	$	10,184	$	35	$	1,517	$	176	$	11,701



	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
	March 31, 2017				March 31, 2016
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses
(In millions)	Gross gains		Gross losses		Gross gains		Gross losses
Investment securities:
Held-to-maturity	$	—	$	—	$	—	$	—
Available-for-sale	—		—		—		—
Other noninterest-bearing investments	10		5		3		3
	10		5		3		3
Net gains			$	5			$	—
Statement of income information:
Securities gains, net			$	5			$	—
Net gains			$	5			$	—

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



(In millions)	Three Months Ended March 31, 2017						Three Months Ended March 31, 2016
	Taxable		Nontaxable		Total		Taxable		Nontaxable		Total
Investment securities:
Held-to-maturity	$	3	$	4	$	7	$	2	$	3	$	5
Available-for-sale	66		5		71		40		2		42
	$	69	$	9	$	78	$	42	$	5	$	47

- 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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