Loans and ACL (Aging Analysis of Past Due Loans and Leases) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans and leases, current	$ 112,629	$ 110,553
Loans and leases, 30-89 days past due	1,120	1,292
Loans and leases, 90 days or more past due	1,233	1,378
Nonaccrual loans and leases	935	1,380
Total loans and leases	115,917	114,603
Total Loans Excluding Government and GNMA Guaranteed [Member]
Loans and leases, current	112,393	110,328
Loans and leases, 30-89 days past due	1,028	1,203
Loans and leases, 90 days or more past due	426	609
Nonaccrual loans and leases	935	1,380
Total loans and leases	114,782	113,520
Commercial and Industrial, Excluding Covered [Member]
Loans and leases, current	38,110	37,706
Loans and leases, 30-89 days past due	35	42
Loans and leases, 90 days or more past due	0	1
Nonaccrual loans and leases	363	546
Total loans and leases	38,508	38,295
CRE - Other, Excluding Covered [Member]
Loans and leases, current	11,535	11,237
Loans and leases, 30-89 days past due	8	12
Loans and leases, 90 days or more past due	0	0
Nonaccrual loans and leases	129	212
Total loans and leases	11,672	11,461
CRE - Residential ADC, Excluding Covered [Member]
Loans and leases, current	901	1,131
Loans and leases, 30-89 days past due	2	2
Loans and leases, 90 days or more past due	0	0
Nonaccrual loans and leases	35	128
Total loans and leases	938	1,261
Commercial Other Lending Subsidiaries, Excluding Covered [Member]
Loans and leases, current	4,482	4,106
Loans and leases, 30-89 days past due	14	20
Loans and leases, 90 days or more past due	5	9
Nonaccrual loans and leases	1	3
Total loans and leases	4,502	4,138
Direct Retail Lending, Excluding Covered [Member]
Loans and leases, current	15,595	15,502
Loans and leases, 30-89 days past due	132	145
Loans and leases, 90 days or more past due	33	38
Nonaccrual loans and leases	109	132
Total loans and leases	15,869	15,817
Retail Revolving Credit, Excluding Covered [Member]
Loans and leases, current	2,370	2,291
Loans and leases, 30-89 days past due	23	23
Loans and leases, 90 days or more past due	10	16
Nonaccrual loans and leases	0	0
Total loans and leases	2,403	2,330
Retail Residential Mortgage, Excluding Covered [Member]
Loans and leases, current	22,738	22,330
Loans and leases, 30-89 days past due	463	498
Loans and leases, 90 days or more past due	69	92
Nonaccrual loans and leases	243	269
Total loans and leases	23,513	23,189
Retail Residential Mortgage, Excluding Covered [Member] | Government Guaranteed Loans [Member]
Loans and leases, current	236	225
Loans and leases, 30-89 days past due	88	84
Loans and leases, 90 days or more past due	296	252
Nonaccrual loans and leases	0	0
Total loans and leases	620	561
Retail Residential Mortgage, Excluding Covered [Member] | GNMA [Member]
Loans and leases, 30-89 days past due	4	5
Loans and leases, 90 days or more past due	511	517
Total loans and leases	515	522
Retail Sales Finance, Excluding Covered [Member]
Loans and leases, current	9,316	7,663
Loans and leases, 30-89 days past due	56	56
Loans and leases, 90 days or more past due	5	10
Nonaccrual loans and leases	5	7
Total loans and leases	9,382	7,736
Retail Other Lending Subsidiaries, Excluding Covered [Member]
Loans and leases, current	5,703	5,645
Loans and leases, 30-89 days past due	207	270
Loans and leases, 90 days or more past due	0	1
Nonaccrual loans and leases	50	83
Total loans and leases	5,960	5,999
Covered [Member]
Loans and leases, current	1,643	2,717
Loans and leases, 30-89 days past due	88	135
Loans and leases, 90 days or more past due	304	442
Nonaccrual loans and leases	0	0
Total loans and leases	$ 2,035	$ 3,294