Segments (Results of Operations and Average Assets by Segment) (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2018		Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2018		Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information
Total Assets	$ 140,695		$ 141,067		$ 140,695	$ 140,695		$ 141,067	$ 142,193
Net interest income	1,020		939			2,016		1,872
Provision for (benefit from) loan and lease losses	33		52			56		126
Net interest income after provision for loan and lease losses	987		887			1,960		1,746
Service charges on deposits	137		139			275		277
Wealth and asset management revenue	108		103			221		211
Corporate banking revenue	120		101			208		175
Card and processing revenue	84		79			163		153
Mortgage banking net revenue	53		55			109		108
Other noninterest income	250		85			708		160
Securities gains (losses), net	(5)		0			(15)		1
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	(4)		2			(17)		2
Total noninterest income	743		564			1,652		1,087
Salaries, wages and incentives	471		397			918		808
Net occupancy expense	74		70			149		148
Card and processing expense	30		33			60		63
Other noninterest expense	287		285			572		555
Employee benefits	78		86			188		196
Equipment expense	30		29			61		57
Technology and communications	67		57			135		116
Total noninterest expense	1,037		957			2,083		1,943
Income (Loss) Before Income Taxes	693		494			1,529		890
Net income (loss)	586		367		1,290	1,290		672
Applicable income tax expense (benefit)	107		127			239		218
Total goodwill	2,462		2,423		2,462	2,462		2,423	$ 2,445
Intersegment Elimination
Segment Reporting Information
Wealth and asset management revenue	(34)	[1]	(33)	[1]		(69)		(67)
Total noninterest income	(34)	[1]	(33)	[1]		(69)	[1]	(67)
Other noninterest expense	(34)		(33)	[1]		(69)		(67)
Total noninterest expense	(34)		(33)			(69)		(67)
Commercial Banking
Segment Reporting Information
Total Assets	58,763		57,766		58,763	58,763		57,766
Net interest income	427		415			846		839
Provision for (benefit from) loan and lease losses	(10)		22			(29)		29
Net interest income after provision for loan and lease losses	437		393			875		810
Service charges on deposits	70		73			139		146
Wealth and asset management revenue	1		1			2		2
Corporate banking revenue	119		100			205		173
Card and processing revenue	14		14			28		28
Mortgage banking net revenue	0		0			0		0
Other noninterest income	25		40			73		80
Securities gains (losses), net	0					0		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	0		0			0		0
Total noninterest income	229	[2]	228	[2]		447	[2]	429
Salaries, wages and incentives	71		60			141		127
Net occupancy expense	6		7			13		13
Card and processing expense	1		1			2		2
Other noninterest expense	263		247			545		507
Employee benefits	9		9			27		27
Equipment expense	6		4			11		8
Technology and communications	2		2			4		5
Total noninterest expense	358		330			743		689
Income (Loss) Before Income Taxes	308		291			579		550
Net income (loss)	289		237			547		453
Applicable income tax expense (benefit)	19		54			32		97
Total goodwill	630		613		630	630		613
Branch Banking
Segment Reporting Information
Total Assets	60,281		57,396		60,281	60,281		57,396
Net interest income	499		437			965		867
Provision for (benefit from) loan and lease losses	47		39			90		80
Net interest income after provision for loan and lease losses	452		398			875		787
Service charges on deposits	67		66			134		130
Wealth and asset management revenue	37		35			74		71
Corporate banking revenue	1		1			2		3
Card and processing revenue	69		64			133		122
Mortgage banking net revenue	1		1			3		3
Other noninterest income	(8)		22			7		45
Securities gains (losses), net	0					0		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	0		0			0		0
Total noninterest income	167	[3],[4]	189	[5],[6]		353	[3],[4]	374
Salaries, wages and incentives	111		104			220		208
Net occupancy expense	44		43			88		90
Card and processing expense	30		33			59		62
Other noninterest expense	208		196			423		388
Employee benefits	26		26			53		53
Equipment expense	12		13			25		26
Technology and communications	1		1			3		2
Total noninterest expense	432		416			871		829
Income (Loss) Before Income Taxes	187		171			357		332
Net income (loss)	147		111			282		215
Applicable income tax expense (benefit)	40		60			75		117
Total goodwill	1,655		1,655		1,655	1,655		1,655
Consumer Lending
Segment Reporting Information
Total Assets	22,128		22,442		22,128	22,128		22,442
Net interest income	59		59			118		120
Provision for (benefit from) loan and lease losses	8		7			20		22
Net interest income after provision for loan and lease losses	51		52			98		98
Service charges on deposits	0		0			0		0
Wealth and asset management revenue	0		0			0		0
Corporate banking revenue	0		0			0		0
Card and processing revenue	0		0			0		0
Mortgage banking net revenue	52		54			106		105
Other noninterest income	4		6			7		9
Securities gains (losses), net	0					0		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	(4)		2			(17)		2
Total noninterest income	52		62			96		116
Salaries, wages and incentives	42		40			82		77
Net occupancy expense	3		3			5		5
Card and processing expense	0		0			0		0
Other noninterest expense	51		55			102		110
Employee benefits	10		10			20		20
Equipment expense	0		0			0		0
Technology and communications	1		1			2		1
Total noninterest expense	107		109			211		213
Income (Loss) Before Income Taxes	(4)		5			(17)		1
Net income (loss)	(3)		3			(14)		1
Applicable income tax expense (benefit)	(1)		2			(3)		0
Total goodwill	0		0		0	0		0
Wealth and Asset Management
Segment Reporting Information
Total Assets	9,270		8,238		9,270	9,270		8,238
Net interest income	45		37			88		75
Provision for (benefit from) loan and lease losses	(11)		(1)			5		3
Net interest income after provision for loan and lease losses	56		38			83		72
Service charges on deposits	0		0			1		1
Wealth and asset management revenue	104		100			214		205
Corporate banking revenue	0		0			1		0
Card and processing revenue	1		1			2		3
Mortgage banking net revenue	0		0			0		0
Other noninterest income	4		0			9		0
Securities gains (losses), net	0					0		0
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	0		0			0		0
Total noninterest income	109		101			227		209
Salaries, wages and incentives	43		37			87		76
Net occupancy expense	3		2			6		5
Card and processing expense	0		0			0		0
Other noninterest expense	70		67			144		134
Employee benefits	7		7			17		16
Equipment expense	0		0			0		0
Technology and communications	0		0			0		0
Total noninterest expense	123		113			254		231
Income (Loss) Before Income Taxes	42		26			56		50
Net income (loss)	33		17			44		33
Applicable income tax expense (benefit)	9		9			12		17
Total goodwill	177		155		177	177		155
General Corporate and Other
Segment Reporting Information
Total Assets	(9,747)		(4,775)		(9,747)	(9,747)		(4,775)
Net interest income	(10)		(9)			(1)		(29)
Provision for (benefit from) loan and lease losses	(1)		(15)			(30)		(8)
Net interest income after provision for loan and lease losses	(9)		6			29		(21)
Service charges on deposits	0		0			1		0
Wealth and asset management revenue	0		0			0		0
Corporate banking revenue	0		0			0		(1)
Card and processing revenue	0		0			0		0
Mortgage banking net revenue	0		0			0		0
Other noninterest income	225		17			612		26
Securities gains (losses), net	(5)					(15)		1
Securities gains (losses), net - non-qualifying hedges on mortgage servcing rights	0		0			0		0
Total noninterest income	220		17			598		26
Salaries, wages and incentives	204		156			388		320
Net occupancy expense	18		15			37		35
Card and processing expense	(1)		(1)			(1)		(1)
Other noninterest expense	(271)		(247)			(573)		(517)
Employee benefits	26		34			71		80
Equipment expense	12		12			25		23
Technology and communications	63		53			126		108
Total noninterest expense	51		22			73		48
Income (Loss) Before Income Taxes	160		1			554		(43)
Net income (loss)	120		(1)			431		(30)
Applicable income tax expense (benefit)	40		2			123		(13)
Total goodwill	$ 0		$ 0		$ 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 $ 41 for branches and land. For more information refer to Note 7 and Note 21 .

[4] Includes impairment charges of $ 33 for branches and land. For more information refer to Note 7 and Note 21 .

[5] Includes impairment charge s of $ 5 for branches and land. For more information refer to Note 7 and Note 21 .

[6] Includes impairment charges of $ 2 for branches and land. For more information refer to Note 7 and Note 21 .