Loans and ACL (Aging Analysis of Past Due Loans and Leases) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Loans and leases excluding covered, current	$ 110,363	$ 107,836
Loans and leases excluding covered, 30-89 days past due	1,023	1,157
Loans and leases excluding covered, 90 days or more past due	885	936
Nonaccrual loans and leases excluding covered	1,030	1,380
Total loans and leases excluding covered loans	113,301	111,309
Total Loans Excluding Government and GNMA Guaranteed [Member]
Loans and leases excluding covered, current	110,103	107,611
Loans and leases excluding covered, 30-89 days past due	923	1,068
Loans and leases excluding covered, 90 days or more past due	122	167
Nonaccrual loans and leases excluding covered	1,030	1,380
Total loans and leases excluding covered loans	112,178	110,226
GNMA [Member]
Loans and leases excluding covered, current	0	0
Nonaccrual loans and leases excluding covered	0	0
Commercial and Industrial, Excluding Covered [Member]
Loans and leases excluding covered, current	37,814	37,706
Loans and leases excluding covered, 30-89 days past due	27	42
Loans and leases excluding covered, 90 days or more past due	0	1
Nonaccrual loans and leases excluding covered	415	546
Total loans and leases excluding covered loans	38,256	38,295
CRE - Other, Excluding Covered [Member]
Loans and leases excluding covered, current	11,167	11,237
Loans and leases excluding covered, 30-89 days past due	13	12
Loans and leases excluding covered, 90 days or more past due	0	0
Nonaccrual loans and leases excluding covered	151	212
Total loans and leases excluding covered loans	11,331	11,461
CRE - Residential ADC, Excluding Covered [Member]
Loans and leases excluding covered, current	938	1,131
Loans and leases excluding covered, 30-89 days past due	2	2
Loans and leases excluding covered, 90 days or more past due	0	0
Nonaccrual loans and leases excluding covered	42	128
Total loans and leases excluding covered loans	982	1,261
Commercial Other Lending Subsidiaries, Excluding Covered [Member]
Loans and leases excluding covered, current	4,410	4,106
Loans and leases excluding covered, 30-89 days past due	14	20
Loans and leases excluding covered, 90 days or more past due	4	9
Nonaccrual loans and leases excluding covered	2	3
Total loans and leases excluding covered loans	4,430	4,138
Direct Retail Lending, Excluding Covered [Member]
Loans and leases excluding covered, current	15,863	15,502
Loans and leases excluding covered, 30-89 days past due	121	145
Loans and leases excluding covered, 90 days or more past due	34	38
Nonaccrual loans and leases excluding covered	110	132
Total loans and leases excluding covered loans	16,128	15,817
Retail Revolving Credit, Excluding Covered [Member]
Loans and leases excluding covered, current	2,300	2,291
Loans and leases excluding covered, 30-89 days past due	22	23
Loans and leases excluding covered, 90 days or more past due	11	16
Nonaccrual loans and leases excluding covered	0	0
Total loans and leases excluding covered loans	2,333	2,330
Retail Residential Mortgage, Excluding Covered [Member]
Loans and leases excluding covered, current	22,184	22,330
Loans and leases excluding covered, 30-89 days past due	424	498
Loans and leases excluding covered, 90 days or more past due	68	92
Nonaccrual loans and leases excluding covered	238	269
Total loans and leases excluding covered loans	22,914	23,189
Retail Residential Mortgage, Excluding Covered [Member] | Government Guaranteed Loans [Member]
Loans and leases excluding covered, current	260	225
Loans and leases excluding covered, 30-89 days past due	95	84
Loans and leases excluding covered, 90 days or more past due	266	252
Nonaccrual loans and leases excluding covered	0	0
Total loans and leases excluding covered loans	621	561
Retail Residential Mortgage, Excluding Covered [Member] | GNMA [Member]
Loans and leases excluding covered, 30-89 days past due	5	5
Loans and leases excluding covered, 90 days or more past due	497	517
Total loans and leases excluding covered loans	502	522
Retail Sales Finance, Excluding Covered [Member]
Loans and leases excluding covered, current	9,076	7,663
Loans and leases excluding covered, 30-89 days past due	46	56
Loans and leases excluding covered, 90 days or more past due	5	10
Nonaccrual loans and leases excluding covered	5	7
Total loans and leases excluding covered loans	9,132	7,736
Retail Other Lending Subsidiaries, Excluding Covered [Member]
Loans and leases excluding covered, current	6,351	5,645
Loans and leases excluding covered, 30-89 days past due	254	270
Loans and leases excluding covered, 90 days or more past due	0	1
Nonaccrual loans and leases excluding covered	67	83
Total loans and leases excluding covered loans	$ 6,672	$ 5,999