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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Assets    
Investment securities – available for sale $ 97,052 $ 69,163
Mortgage servicing rights 1,067 1,644
Financial derivatives 5,158 2,196
Liabilities    
Financial derivatives $ 804 $ 539
Assets At Fair Value [Member] | Assets, Total [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 25.00% 20.00%
Level Three Assets [Member] | Assets, Total [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 4.00% 7.00%
Level Three Assets [Member] | Assets [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Liabilities At Fair Value [Member] | Liabilities, Total [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Level Three Liabilities [Member] | Liabilities, Total [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 6.00% 13.00%
Level Three Liabilities [Member] | Liability [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale $ 97,052 $ 69,163
Loans 1,031 742
Equity investments 2,280 2,421
Trading securities 3,076 3,220
Financial derivatives 8,179 3,502
Other assets 391 470
Total Assets 114,311 82,227
Liabilities    
Other borrowed funds 2,001 518
Financial derivatives 3,229 2,019
Other liabilities 85 137
Total liabilities 5,315 2,674
Level 1 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 19,907 16,236
Equity investments 821 855
Trading securities 1,815 433
Other assets 328 339
Total Assets 22,871 17,863
Liabilities    
Other borrowed funds 1,961 385
Financial derivatives 4  
Total liabilities 1,965 385
Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 75,353 50,872
Loans 424 442
Trading securities 1,261 2,787
Financial derivatives 8,038 3,448
Other assets 63 131
Total Assets 86,226 58,679
Liabilities    
Other borrowed funds 38 126
Financial derivatives 3,016 1,819
Total liabilities 3,054 1,945
Level 3 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 1,792 2,055
Loans 607 300
Equity investments 1,183 1,276
Financial derivatives 141 54
Total Assets 4,938 5,395
Liabilities    
Other borrowed funds 2 7
Financial derivatives 209 200
Other liabilities 85 137
Total liabilities 296 344
Residential Mortgage [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 831 819
Mortgage servicing rights 577 995
Residential Mortgage [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 743 817
Residential Mortgage [Member] | Level 3 [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 88 2
Mortgage servicing rights 577 995
Commercial Mortgage [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 404 246
Mortgage servicing rights 490 649
Commercial Mortgage [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 344 182
Commercial Mortgage [Member] | Level 3 [Member] | Fair Value, Recurring [Member]    
Assets    
Loans held for sale 60 64
Mortgage servicing rights 490 649
US Treasury and Government [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 20,188 16,516
US Treasury and Government [Member] | Level 1 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 19,907 16,236
US Treasury and Government [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 281 280
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 57,480 36,321
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 1,682 1,814
Residential Mortgage-backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 57,480 36,321
Residential Mortgage-backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 191 73
Residential Mortgage-backed Securities [Member] | Level 3 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 1,491 1,741
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 3,140 3,118
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 4,039 3,372
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 3,140 3,118
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 4,020 3,372
Commercial Mortgage Backed Securities [Member] | Level 3 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 19  
Asset backed [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 5,368 5,114
Asset backed [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 5,158 4,874
Asset backed [Member] | Level 3 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 210 240
Other [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 5,155 2,908
Other [Member] | Level 2 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale 5,083 2,834
Other [Member] | Level 3 [Member] | Fair Value, Recurring [Member]    
Assets    
Investment securities – available for sale $ 72 $ 74