Loans and ACL (Analysis of the Allowance for Credit Losses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Provision for credit losses	$ 592	$ 1,057	$ 1,190
Commercial and Industrial, Excluding Covered [Member]
ACL, Beginning balance	470	433	621
Loans and leases charged-off	(248)	(337)	(323)
Recoveries of previous charge-offs	47	17	28
Provision for credit losses	166	357	107
Other	19
ACL, Ending balance	454	470	433
CRE - Other, Excluding Covered [Member]
ACL, Beginning balance	204	334	446
Loans and leases charged-off	(84)	(205)	(273)
Recoveries of previous charge-offs	28	13	18
Provision for credit losses	16	62	143
Other	14
ACL, Ending balance	178	204	334
CRE - Residential ADC, Excluding Covered [Member]
ACL, Beginning balance	100	286	469
Loans and leases charged-off	(48)	(190)	(302)
Recoveries of previous charge-offs	23	41	25
Provision for credit losses	(32)	(37)	94
Other	4
ACL, Ending balance	47	100	286
Commercial Other Lending Subsidiaries, Excluding Covered [Member]
ACL, Beginning balance	13	11	21
Loans and leases charged-off	(3)	(8)	(9)
Recoveries of previous charge-offs	2	2	3
Provision for credit losses	3	8	(4)
ACL, Ending balance	15	13	11
Direct Retail Lending, Excluding Covered [Member]
ACL, Beginning balance	300	232	246
Loans and leases charged-off	(148)	(224)	(276)
Recoveries of previous charge-offs	38	36	37
Provision for credit losses	15	256	225
Other	4
ACL, Ending balance	209	300	232
Retail Revolving Credit, Excluding Covered [Member]
ACL, Beginning balance	102	112	109
Loans and leases charged-off	(85)	(81)	(95)
Recoveries of previous charge-offs	17	18	19
Provision for credit losses	81	53	79
ACL, Ending balance	115	102	112
Retail Residential Mortgage, Excluding Covered [Member]
ACL, Beginning balance	328	365	298
Loans and leases charged-off	(81)	(136)	(269)
Recoveries of previous charge-offs	3	3	5
Provision for credit losses	37	96	331
Other	44
ACL, Ending balance	331	328	365
Retail Sales Finance, Excluding Covered [Member]
ACL, Beginning balance	29	38	47
Loans and leases charged-off	(23)	(26)	(32)
Recoveries of previous charge-offs	9	10	9
Provision for credit losses	30	7	14
ACL, Ending balance	45	29	38
Retail Other Lending Subsidiaries, Excluding Covered [Member]
ACL, Beginning balance	264	186	177
Loans and leases charged-off	(252)	(217)	(181)
Recoveries of previous charge-offs	32	24	22
Provision for credit losses	245	271	168
Other	(65)
ACL, Ending balance	224	264	186
Covered [Member]
ACL, Beginning balance	128	149	144
Loans and leases charged-off	(19)	(34)	(66)
Recoveries of previous charge-offs	0	0	0
Provision for credit losses	5	13	71
ACL, Ending balance	114	128	149
Unallocated [Member]
ACL, Beginning balance	80	110	130
Loans and leases charged-off	0	0	0
Recoveries of previous charge-offs	0	0	0
Provision for credit losses	(33)	(30)	(20)
Other	(47)
ACL, Ending balance	0	80	110
Allowance for Loan and Lease Losses [Member]
ACL, Beginning balance	2,018	2,256	2,708
Loans and leases charged-off	(991)	(1,458)	(1,826)
Recoveries of previous charge-offs	199	164	166
Provision for credit losses	533	1,056	1,208
Other	(27)
ACL, Ending balance	1,732	2,018	2,256
Reserve For Unfunded Lending Commitments [Member]
ACL, Beginning balance	30	29	47
Loans and leases charged-off	0	0	0
Recoveries of previous charge-offs	0	0	0
Provision for credit losses	59	1	(18)
ACL, Ending balance	89	30	29
Allowance for Credit Losses [Member]
ACL, Beginning balance	2,048	2,285	2,755
Loans and leases charged-off	(991)	(1,458)	(1,826)
Recoveries of previous charge-offs	199	164	166
Provision for credit losses	592	1,057	1,190
Other	(27)
ACL, Ending balance	$ 1,821	$ 2,048	$ 2,285