Outstanding Loans and Leases - Impaired Loans Commercial Loans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Commercial Real Estate Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	$ 1,320		$ 3,290
Carrying Value	959		2,164
Related Allowance	61		201
Average Carrying Value	1,417		3,245		5,303
Interest Income Recognized	31	[1]	32	[1]	26	[1]
Small Business Commercial Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	186	[2]	361	[2]
Carrying Value	176	[2]	317	[2]
Related Allowance	36	[2]	97	[2]
Average Carrying Value	236	[2]	409	[2]	666	[2]
Interest Income Recognized	6	[1],[2]	13	[1],[2]	23	[1],[2]
Commercial Portfolio Segment [Member]
Financing Receivable, Impaired [Line Items]
Real Estate Acquired Through Foreclosure	90		250
U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	2,190		3,002
Carrying Value	1,839		2,247
Related Allowance	164		159
Average Carrying Value	1,995		2,692		3,196
Interest Income Recognized	53	[1]	64	[1]	20	[1]
Non-U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	264		520
Carrying Value	74		153
Related Allowance	16		18
Average Carrying Value	137		181		177
Interest Income Recognized	5	[1]	4	[1]	3	[1]
Financing Receivable With Related Allowance [Member] | Commercial Real Estate Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,066		2,920
Carrying Value	731		1,848
Related Allowance	61		201
Average Carrying Value	1,148		2,126		3,309
Interest Income Recognized	28	[1]	29	[1]	19	[1]
Financing Receivable With Related Allowance [Member] | Small Business Commercial Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	186	[2]	361	[2]
Carrying Value	176	[2]	317	[2]
Related Allowance	36	[2]	97	[2]
Average Carrying Value	236	[2]	409	[2]	666	[2]
Interest Income Recognized	6	[1],[2]	13	[1],[2]	23	[1],[2]
Financing Receivable With Related Allowance [Member] | U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	1,581		2,431
Carrying Value	1,262		1,771
Related Allowance	164		159
Average Carrying Value	1,553		2,104		2,422
Interest Income Recognized	47	[1]	55	[1]	13	[1]
Financing Receivable With Related Allowance [Member] | Non-U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	254		365
Carrying Value	64		117
Related Allowance	16		18
Average Carrying Value	109		77		76
Interest Income Recognized	5	[1]	4	[1]	3	[1]
Financing Receivable Without Related Allowance [Member] | Commercial Real Estate Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	254		370
Carrying Value	228		316
Related Allowance	0		0
Average Carrying Value	269		1,119		1,994
Interest Income Recognized	3	[1]	3	[1]	7	[1]
Financing Receivable Without Related Allowance [Member] | U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	609		571
Carrying Value	577		476
Related Allowance	0		0
Average Carrying Value	442		588		774
Interest Income Recognized	6	[1]	9	[1]	7	[1]
Financing Receivable Without Related Allowance [Member] | Non-U.S. Commercial | Commercial Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal Balance	10		155
Carrying Value	10		36
Related Allowance	0		0
Average Carrying Value	28		104		101
Interest Income Recognized	$ 0	[1]	$ 0	[1]	$ 0	[1]

[1] Interest income recognized includes interest accrued and collected on the outstanding balances of accruing impaired loans as well as interest cash collections on nonaccruing impaired loans for which the principal is considered collectible.

[2] Includes U.S. small business commercial renegotiated TDR loans and related allowance.