Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Assets
Total securities available for securities	$ 65,051	$ 63,389
Mortgage servicing rights	1,800	2,000
Financial derivatives	1,371	1,052
Liabilities
Financial derivatives	584	1,063
Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	65,051	63,389
Loans	758	782
Equity investments	1,974	2,209
Trading securities	3,545	3,916
Financial derivatives	2,368	2,081
Other assets	447	493
Total Assets	76,591	75,744
Liabilities
Other borrowed funds	1,494	1,007
Financial derivatives	1,905	2,290
Other liabilities	62	58
Total liabilities	3,461	3,355
Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	18,642	17,753
Equity investments	569	751
Trading securities	1,991	2,137
Financial derivatives	4	3
Other assets	318	291
Total Assets	21,524	20,935
Liabilities
Other borrowed funds	1,389	868
Financial derivatives	3	1
Total liabilities	1,392	869
Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	44,016	43,150
Loans	486	510
Trading securities	1,552	1,777
Financial derivatives	2,308	2,053
Other assets	129	157
Total Assets	49,052	48,449
Liabilities
Other borrowed funds	99	132
Financial derivatives	1,672	2,021
Total liabilities	1,771	2,153
Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,393	2,486
Loans	272	272
Equity investments	1,217	1,255
Trading securities	2	2
Financial derivatives	56	25
Other assets		45
Total Assets	5,827	6,157
Liabilities
Other borrowed funds	6	7
Financial derivatives	230	268
Other liabilities	62	58
Total liabilities	298	333
Residential Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	473	495
Mortgage servicing rights	1,131	1,257
Residential Mortgage [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	471	493
Residential Mortgage [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	2	2
Mortgage servicing rights	1,131	1,257
Commercial Mortgage [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	163	396
Mortgage servicing rights	681	726
Commercial Mortgage [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	90	309
Commercial Mortgage [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Loans held for sale	73	87
Mortgage servicing rights	681	726
US Treasury and Government [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	18,991	18,100
US Treasury and Government [Member] \| Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	18,642	17,753
US Treasury and Government [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	349	347
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	29,528	28,993
Residential Mortgage-backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,125	2,211
Residential Mortgage-backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	29,528	28,993
Residential Mortgage-backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	83	83
Residential Mortgage-backed Securities [Member] \| Level 3 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,042	2,128
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,573	2,577
Commercial Mortgage Backed Securities [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,832	2,657
Commercial Mortgage Backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,573	2,577
Commercial Mortgage Backed Securities [Member] \| Level 2 [Member] \| Mortgage-backed Securities Non-agency [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	2,832	2,657
Asset backed [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	5,565	4,972
Asset backed [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	5,299	4,698
Asset backed [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	266	274
Other [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	3,437	3,879
Other [Member] \| Level 2 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	3,352	3,795
Other [Member] \| Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets
Total securities available for securities	$ 85	$ 84

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