Fair Value (Recurring Fair Value Measurements) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2023	Dec. 31, 2022
Assets
Investment securities – available for sale	$ 43,220	$ 44,159
Mortgage servicing rights	3,293	3,423
Financial derivatives	1,001	1,531
Liabilities
Financial derivatives	$ 3,687	$ 4,524
Assets At Fair Value \| Assets, Total \| Assets
Liabilities
Concentration risk, percentage	10.00%	11.00%
Level 3 Assets \| Assets, Total \| Assets
Liabilities
Concentration risk, percentage	12.00%	12.00%
Level 3 Assets \| Assets \| Assets
Liabilities
Concentration risk, percentage	1.00%	1.00%
Liabilities At Fair Value \| Liabilities, Total \| Liability
Liabilities
Concentration risk, percentage	2.00%	2.00%
Level Three Liabilities \| Liabilities, Total \| Liability
Liabilities
Concentration risk, percentage	4.00%	4.00%
Level Three Liabilities \| Liability \| Liability
Liabilities
Concentration risk, percentage	1.00%	1.00%
Fair Value, Recurring
Assets
Investment securities – available for sale	$ 43,220	$ 44,159
Loans	1,287	1,310
Equity investments	3,127	3,147
Trading securities	2,325	1,966
Financial derivatives	3,153	3,768
Other assets	439	432
Total Assets	57,788	59,135
Liabilities
Other borrowed funds	1,404	1,466
Financial derivatives	6,116	7,618
Other liabilities	229	294
Total liabilities	7,749	9,378
Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	7,500	8,108
Equity investments	1,092	1,173
Trading securities	528	798
Financial derivatives	15	16
Other assets	374	352
Total Assets	9,509	10,447
Liabilities
Other borrowed funds	1,331	1,230
Financial derivatives	7	4
Total liabilities	1,338	1,234
Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	34,756	35,050
Loans	530	541
Trading securities	1,797	1,168
Financial derivatives	3,119	3,747
Other assets	65	80
Total Assets	40,937	41,240
Liabilities
Other borrowed funds	68	232
Financial derivatives	6,012	7,491
Total liabilities	6,080	7,723
Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	964	1,001
Loans	757	769
Equity investments	1,835	1,778
Financial derivatives	19	5
Total Assets	7,142	7,252
Liabilities
Other borrowed funds	5	4
Financial derivatives	97	123
Other liabilities	229	294
Total liabilities	331	421
Residential mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	627	654
Residential mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	385	411
Residential mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	242	243
Commercial mortgage loans held for sale \| Fair Value, Recurring
Assets
Loans held for sale	317	276
Commercial mortgage loans held for sale \| Level 2 \| Fair Value, Recurring
Assets
Loans held for sale	285	243
Commercial mortgage loans held for sale \| Level 3 \| Fair Value, Recurring
Assets
Loans held for sale	32	33
U.S. Treasury and government agencies \| Fair Value, Recurring
Assets
Investment securities – available for sale	7,747	8,370
U.S. Treasury and government agencies \| Level 1 \| Fair Value, Recurring
Assets
Investment securities – available for sale	7,500	8,108
U.S. Treasury and government agencies \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	247	262
Residential mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	28,695	28,823
Residential mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	787	819
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	28,695	28,823
Residential mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale
Residential mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	787	819
Commercial mortgage-backed \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,705	1,675
Commercial mortgage-backed \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	955	1,256
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	1,705	1,675
Commercial mortgage-backed \| Level 2 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	952	1,253
Commercial mortgage-backed \| Level 3 \| Mortgage-backed Securities Non-agency \| Fair Value, Recurring
Assets
Investment securities – available for sale	3	3
Asset-backed \| Fair Value, Recurring
Assets
Investment securities – available for sale	419	129
Asset-backed \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	298	5
Asset-backed \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	121	124
Other \| Fair Value, Recurring
Assets
Investment securities – available for sale	2,912	3,087
Other \| Level 2 \| Fair Value, Recurring
Assets
Investment securities – available for sale	2,859	3,032
Other \| Level 3 \| Fair Value, Recurring
Assets
Investment securities – available for sale	53	55
Residential mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	2,232	2,310
Residential mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	2,232	2,310
Commercial mortgage servicing rights \| Fair Value, Recurring
Assets
Mortgage servicing rights	1,061	1,113
Commercial mortgage servicing rights \| Level 3 \| Fair Value, Recurring
Assets
Mortgage servicing rights	$ 1,061	$ 1,113

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Fair value of obligations measured on a recurring basis.

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