Loans and ACL (Schedule of Information Regarding Impaired Loans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Related allowance	$ 1,732		$ 2,018
Impaired Loans Excluding Acquired Impaired And Government Guaranteed Loans [Member]
Recorded investment	2,136	[1]	2,434	[1]
UPB	2,461	[1]	2,882	[1]
Related allowance	312	[1]	385	[1]
Average recorded investment	2,328	[1]	2,356	[1]
Interest income recognized	77	[1]	53	[1]
Impaired Financing Receivable With No Related Allowance Recorded [Member] | Commercial and Industrial, Excluding Covered [Member]
Recorded investment	91		116
UPB	165		232
Average recorded investment	111		117
Interest income recognized	0		0
Impaired Financing Receivable With No Related Allowance Recorded [Member] | CRE - Other, Excluding Covered [Member]
Recorded investment	25		60
UPB	41		108
Average recorded investment	53		81
Interest income recognized	0		0
Impaired Financing Receivable With No Related Allowance Recorded [Member] | CRE - Residential ADC, Excluding Covered [Member]
Recorded investment	16		44
UPB	36		115
Average recorded investment	31		103
Interest income recognized	0		0
Impaired Financing Receivable With No Related Allowance Recorded [Member] | Direct Retail Lending, Excluding Covered [Member]
Recorded investment	23		19
UPB	76		73
Average recorded investment	23		19
Interest income recognized	1		1
Impaired Financing Receivable With No Related Allowance Recorded [Member] | Retail Residential Mortgage, Excluding Covered [Member]
Recorded investment	144	[1]	120	[1]
UPB	237	[1]	201	[1]
Average recorded investment	129	[1]	80	[1]
Interest income recognized	4	[1]	2	[1]
Impaired Financing Receivable With No Related Allowance Recorded [Member] | Retail Sales Finance, Excluding Covered [Member]
Recorded investment	1		1
UPB	2		3
Average recorded investment	1		1
Interest income recognized	0		0
Impaired Financing Receivable With No Related Allowance Recorded [Member] | Retail Other Lending Subsidiaries, Excluding Covered [Member]
Recorded investment	2		2
UPB	6		6
Average recorded investment	4		3
Interest income recognized	0		0
Impaired Financing Receivable With Related Allowance Recorded [Member] | Commercial and Industrial, Excluding Covered [Member]
Recorded investment	375		515
UPB	409		551
Related allowance	72		73
Average recorded investment	453		522
Interest income recognized	5		3
Impaired Financing Receivable With Related Allowance Recorded [Member] | CRE - Other, Excluding Covered [Member]
Recorded investment	206		252
UPB	208		255
Related allowance	28		36
Average recorded investment	233		319
Interest income recognized	5		5
Impaired Financing Receivable With Related Allowance Recorded [Member] | CRE - Residential ADC, Excluding Covered [Member]
Recorded investment	41		111
UPB	42		116
Related allowance	9		21
Average recorded investment	76		180
Interest income recognized	2		1
Impaired Financing Receivable With Related Allowance Recorded [Member] | Commercial Other Lending Subsidiaries, Excluding Covered [Member]
Recorded investment	1		3
UPB	1		3
Related allowance	0		1
Average recorded investment	2		4
Interest income recognized	0		0
Impaired Financing Receivable With Related Allowance Recorded [Member] | Direct Retail Lending, Excluding Covered [Member]
Recorded investment	198		216
UPB	204		226
Related allowance	43		59
Average recorded investment	204		140
Interest income recognized	12		9
Impaired Financing Receivable With Related Allowance Recorded [Member] | Retail Revolving Credit, Excluding Covered [Member]
Recorded investment	48		56
UPB	48		56
Related allowance	19		24
Average recorded investment	52		59
Interest income recognized	2		2
Impaired Financing Receivable With Related Allowance Recorded [Member] | Retail Residential Mortgage, Excluding Covered [Member]
Recorded investment	812	[1]	754	[1]
UPB	830	[1]	770	[1]
Related allowance	109	[1]	104	[1]
Average recorded investment	763	[1]	649	[1]
Interest income recognized	34	[1]	28	[1]
Impaired Financing Receivable With Related Allowance Recorded [Member] | Retail Sales Finance, Excluding Covered [Member]
Recorded investment	18		21
UPB	19		21
Related allowance	4		6
Average recorded investment	20		13
Interest income recognized	1		0
Impaired Financing Receivable With Related Allowance Recorded [Member] | Retail Other Lending Subsidiaries, Excluding Covered [Member]
Recorded investment	135		144
UPB	137		146
Related allowance	28		61
Average recorded investment	173		66
Interest income recognized	11		2
Government Guaranteed Loans [Member] | Retail Residential Mortgage, Excluding Covered [Member]
Recorded investment	376		313
Related allowance	$ 55		$ 26

[1] Residential mortgage loans exclude $376 million and $313 million in government guaranteed loans and related ALLL of $55 million and $26 million as of December 31, 2013 and December 31, 2012, respectively.