Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017
Segment Reporting Information
Total Assets		$ 141,500		$ 141,500	$ 140,200		$ 142,193
Net interest income		996			933
Provision for (benefit from) loan and lease losses		23			74
Net interest income after provision for loan and lease losses		973			859
Service charges on deposits		137			138
Wealth and asset management revenue		113			108
Corporate banking revenue		88			74
Card and processing revenue		79			74
Mortgage banking net revenue		56			52
Other noninterest income		460			77
Securities gains (losses), net		(11)			0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		(13)			0
Total noninterest income		909			523
Salaries, wages and incentives		447			411
Net occupancy expense		75			78
Card and processing expense		29			30
Other noninterest expense		286			270
Employee benefits		110			111
Equipment expense		31			28
Technology and communications		68			58
Total noninterest expense		1,046			986
Income (Loss) Before Income Taxes		836			396
Net income (loss)		704		704	305
Applicable income tax expense (benefit)		132			91
Total goodwill		2,462		2,462	2,419		$ 2,445
Intersegment Elimination
Segment Reporting Information
Wealth and asset management revenue	[1]	(34)			(34)
Total noninterest income	[1]	(34)			(34)
Other noninterest expense		(34)			(34)	[1]
Total noninterest expense		(34)			(34)
Commercial Banking
Segment Reporting Information
Total Assets		58,829		58,829	57,672
Net interest income		419			425
Provision for (benefit from) loan and lease losses		(20)			6
Net interest income after provision for loan and lease losses		439			419
Service charges on deposits		71			73
Wealth and asset management revenue		1			1
Corporate banking revenue		86			73
Card and processing revenue		14			14
Mortgage banking net revenue		0			0
Other noninterest income		49			41
Securities gains (losses), net		(2)
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		0
Total noninterest income	[2]	219			202
Salaries, wages and incentives		70			67
Net occupancy expense		7			7
Card and processing expense		1			1
Other noninterest expense		281			260
Employee benefits		18			18
Equipment expense		5			4
Technology and communications		2			3
Total noninterest expense		384			360
Income (Loss) Before Income Taxes		274			261
Net income (loss)		259			217
Applicable income tax expense (benefit)		15			44
Total goodwill		630		630	613
Branch Banking
Segment Reporting Information
Total Assets		60,197		60,197	57,883
Net interest income		466			430
Provision for (benefit from) loan and lease losses		44			42
Net interest income after provision for loan and lease losses		422			388
Service charges on deposits		66			65
Wealth and asset management revenue		37			36
Corporate banking revenue		1			1
Card and processing revenue		64			59
Mortgage banking net revenue		1			1
Other noninterest income		15			22
Securities gains (losses), net		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		0
Total noninterest income		184	[3]		184	[4]
Salaries, wages and incentives		110			104
Net occupancy expense		43			47
Card and processing expense		29			29
Other noninterest expense		215			192
Employee benefits		26			27
Equipment expense		13			13
Technology and communications		1			1
Total noninterest expense		437			413
Income (Loss) Before Income Taxes		169			159
Net income (loss)		134			103
Applicable income tax expense (benefit)		35			56
Total goodwill		1,655		1,655	1,655
Consumer Lending
Segment Reporting Information
Total Assets		22,384		22,384	21,994
Net interest income		59			61
Provision for (benefit from) loan and lease losses		12			15
Net interest income after provision for loan and lease losses		47			46
Service charges on deposits		0			0
Wealth and asset management revenue		0			0
Corporate banking revenue		0			0
Card and processing revenue		0			0
Mortgage banking net revenue		55			51
Other noninterest income		4			4
Securities gains (losses), net		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		(13)
Total noninterest income		46			55
Salaries, wages and incentives		39			37
Net occupancy expense		3			3
Card and processing expense		0			0
Other noninterest expense		52			54
Employee benefits		11			11
Equipment expense		0			0
Technology and communications		1			1
Total noninterest expense		106			106
Income (Loss) Before Income Taxes		(13)			(5)
Net income (loss)		(10)			(3)
Applicable income tax expense (benefit)		(3)			(2)
Total goodwill		0		0	0
Wealth and Asset Management
Segment Reporting Information
Total Assets		10,611		10,611	9,644
Net interest income		43			38
Provision for (benefit from) loan and lease losses		16			4
Net interest income after provision for loan and lease losses		27			34
Service charges on deposits		0			0
Wealth and asset management revenue		109			105
Corporate banking revenue		1			0
Card and processing revenue		1			1
Mortgage banking net revenue		0			0
Other noninterest income		5			0
Securities gains (losses), net		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		0
Total noninterest income		116			106
Salaries, wages and incentives		44			39
Net occupancy expense		3			2
Card and processing expense		0			0
Other noninterest expense		74			67
Employee benefits		10			9
Equipment expense		0			0
Technology and communications		0			0
Total noninterest expense		131			117
Income (Loss) Before Income Taxes		12			23
Net income (loss)		9			15
Applicable income tax expense (benefit)		3			8
Total goodwill		177		177	151
General Corporate and Other
Segment Reporting Information
Total Assets		(10,521)		(10,521)	(6,993)	[2]
Net interest income		9			(21)
Provision for (benefit from) loan and lease losses		(29)			7
Net interest income after provision for loan and lease losses		38			(28)
Service charges on deposits		0			0
Wealth and asset management revenue		0			0
Corporate banking revenue		0			0
Card and processing revenue		0			0
Mortgage banking net revenue		0			0
Other noninterest income		387			10
Securities gains (losses), net		(9)
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights		0
Total noninterest income		378			10
Salaries, wages and incentives		184			164
Net occupancy expense		19			19
Card and processing expense		(1)			0
Other noninterest expense		(302)			(269)
Employee benefits		45			46
Equipment expense		13			11
Technology and communications		64			53
Total noninterest expense		22			24
Income (Loss) Before Income Taxes		394			(42)
Net income (loss)		312			(27)
Applicable income tax expense (benefit)		82			(15)
Total goodwill		$ 0		$ 0	$ 0

[1] Revenue sharing agreements between wealth and asset management and branch banking are eliminated in the Condensed Consolidated Statements of Income.

[2] Includes impairment charges of $ 31 for operating lease equipment. For more information refer to Note 21 .

[3] Includes impairment charges of $ 8 for branches and land. For more information refer to Note 7 and Note 21 .

[4] Includes impairment charges of $ 3 for branches and land. For more information refer to Note 7 and Note 21 .