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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets    
Securities available for sale, fair value $ 61,211 $ 57,618
Mortgage servicing rights 2,136 1,832
Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 61,211 57,033
Securities available for sale, fair value 61,211 57,618
Loans 753 869
Equity investments 1,904 1,265
Trading securities 3,563 2,915
Financial derivatives 1,789 2,874
Other assets 553 638
Total Assets 72,958 69,673
Liabilities    
Other borrowed funds 887 1,344
Financial derivatives 2,942 2,856
Other liabilities 55 33
Total liabilities 3,884 4,233
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 16,422 14,088
Securities available for sale, fair value 16,422 14,612
Equity investments 591  
Trading securities 1,678 1,243
Other assets 309 278
Total Assets 19,000 16,133
Liabilities    
Other borrowed funds 517 1,079
Total liabilities 517 1,079
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 42,139 39,865
Securities available for sale, fair value 42,139 39,926
Loans 472 571
Equity investments 59  
Trading securities 1,883 1,670
Financial derivatives 1,781 2,864
Other assets 186 253
Total Assets 47,477 46,836
Liabilities    
Other borrowed funds 361 254
Financial derivatives 2,600 2,369
Total liabilities 2,961 2,623
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,650 3,080
Securities available for sale, fair value 2,650 3,080
Loans 281 298
Equity investments 1,042 1,036
Trading securities 2 2
Financial derivatives 8 10
Other assets 58 107
Total Assets 6,269 6,475
Liabilities    
Other borrowed funds 9 11
Financial derivatives 342 487
Other liabilities 55 33
Total liabilities 406 531
Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 631 832
Mortgage servicing rights 1,370 1,164
Residential Mortgage [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 628 829
Residential Mortgage [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 3 3
Mortgage servicing rights 1,370 1,164
Commercial Mortgage [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 418 830
Mortgage servicing rights 766 668
Commercial Mortgage [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 329 723
Commercial Mortgage [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 89 107
Mortgage servicing rights 766 668
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 16,851 14,521
US Treasury and Government [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 16,422 14,088
US Treasury and Government [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 429 433
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 27,902 25,406
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,352 2,758
Residential Mortgage-backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 27,902 25,406
Residential Mortgage-backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 84 97
Residential Mortgage-backed Securities [Member] | Level 3 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,268 2,661
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 1,965 1,904
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,539 2,613
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 1,965 1,904
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,539 2,613
Asset backed [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 5,592 5,397
Asset backed [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 5,299 5,065
Asset backed [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 293 332
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 4,010 4,434
Other Debt Obligations [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 3,921 4,347
Other Debt Obligations [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 89 87
Other Assets Fair Value [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Securities available for sale, fair value 585
Other Assets Fair Value [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Securities available for sale, fair value   524
Other Assets Fair Value [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Securities available for sale, fair value   61
Other Assets Fair Value [Member] | Accounting Standards Update 2016-01 [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Securities reclassified as equity investments   $ 600