Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Assets
Securities available for sale, fair value	$ 57,254	$ 60,104
Mortgage servicing rights	1,854	1,758
Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	56,720	59,503
Securities available for sale, fair value	57,254	60,104
Loans	807	893
Equity investments	1,312	1,381
Trading securities	2,670	2,629
Financial derivatives	3,093	4,616
Other assets	625	817
Total Assets	69,215	74,608
Liabilities
Other borrowed funds	1,560	970
Financial derivatives	2,608	3,839
Other liabilities	34	9
Total liabilities	4,202	4,818
Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	842	1,010
Mortgage servicing rights	1,226	1,182
Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	758	1,400
Mortgage servicing rights	628	576
US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	13,384	13,174
Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	25,750	26,128
Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,946	3,366
Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	1,977	2,119
Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,751	4,025
Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	5,352	5,968
Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	4,560	4,723
Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	534	601
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	12,788	12,572
Securities available for sale, fair value	13,261	13,113
Trading securities	1,080	1,458
Financial derivatives	3	10
Other assets	265	266
Total Assets	14,609	14,847
Liabilities
Other borrowed funds	1,311	799
Financial derivatives		1
Total liabilities	1,311	800
Level 1 [Member] \| US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	12,788	12,572
Level 1 [Member] \| Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	473	541
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	40,656	43,208
Securities available for sale, fair value	40,717	43,268
Loans	516	558
Trading securities	1,588	1,169
Financial derivatives	3,068	4,566
Other assets	266	312
Total Assets	46,995	50,881
Liabilities
Other borrowed funds	240	161
Financial derivatives	2,360	3,424
Total liabilities	2,600	3,585
Level 2 [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	840	1,008
Level 2 [Member] \| US Treasury and Government Agencies Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	596	602
Level 2 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	25,750	26,128
Level 2 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	101	112
Level 2 [Member] \| Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	1,977	2,119
Level 2 [Member] \| Commercial mortgage-backed securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,751	4,025
Level 2 [Member] \| Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	5,004	5,565
Level 2 [Member] \| Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	4,477	4,657
Level 2 [Member] \| Corporate Stocks And Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Securities available for sale, fair value	61	60
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	3,276	3,723
Securities available for sale, fair value	3,276	3,723
Loans	291	335
Equity investments	1,061	1,331
Trading securities	2	2
Financial derivatives	22	40
Other assets	94	239
Total Assets	7,360	8,830
Liabilities
Other borrowed funds	9	10
Financial derivatives	248	414
Other liabilities	34	9
Total liabilities	291	433
Level 3 [Member] \| Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	2	2
Mortgage servicing rights	1,226	1,182
Level 3 [Member] \| Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	758	1,400
Mortgage servicing rights	628	576
Level 3 [Member] \| Residential mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	2,845	3,254
Level 3 [Member] \| Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	348	403
Level 3 [Member] \| Other Debt Securities [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total debt securities	$ 83	$ 66

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