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Fair Value (Recurring Fair Value Measurements) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Assets    
Securities available for sale, fair value $ 60,275 $ 57,618
Mortgage servicing rights 2,045 1,832
Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 60,275 57,033
Securities available for sale, fair value 60,275 57,618
Loans 753 869
Equity investments 2,115 1,265
Trading securities 3,072 2,915
Financial derivatives 1,892 2,874
Other assets 549 638
Total Assets 71,936 69,673
Liabilities    
Other borrowed funds 838 1,344
Financial derivatives 2,883 2,856
Other liabilities 47 33
Total liabilities 3,768 4,233
Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 15,766 14,088
Securities available for sale, fair value 15,766 14,612
Equity investments 672  
Trading securities 1,370 1,243
Other assets 282 278
Total Assets 18,090 16,133
Liabilities    
Other borrowed funds 479 1,079
Total liabilities 479 1,079
Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 41,705 39,865
Securities available for sale, fair value 41,705 39,926
Loans 471 571
Equity investments 59  
Trading securities 1,700 1,670
Financial derivatives 1,876 2,864
Other assets 204 253
Total Assets 47,155 46,836
Liabilities    
Other borrowed funds 352 254
Financial derivatives 2,499 2,369
Total liabilities 2,851 2,623
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,804 3,080
Securities available for sale, fair value 2,804 3,080
Loans 282 298
Equity investments 1,167 1,036
Trading securities 2 2
Financial derivatives 16 10
Other assets 63 107
Total Assets 6,474 6,475
Liabilities    
Other borrowed funds 7 11
Financial derivatives 384 487
Other liabilities 47 33
Total liabilities 438 531
Residential Mortgage [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 767 832
Mortgage servicing rights 1,297 1,164
Residential Mortgage [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 763 829
Residential Mortgage [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 4 3
Mortgage servicing rights 1,297 1,164
Commercial Mortgage [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 468 830
Mortgage servicing rights 748 668
Commercial Mortgage [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 377 723
Commercial Mortgage [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Loans held for sale 91 107
Mortgage servicing rights 748 668
US Treasury and Government [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 16,200 14,521
US Treasury and Government [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 15,766 14,088
US Treasury and Government [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 434 433
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 27,619 25,406
Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,494 2,758
Residential Mortgage-backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 27,619 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 89 97
Residential Mortgage-backed Securities [Member] | Level 3 [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,405 2,661
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 1,808 1,904
Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 2,567 2,613
Commercial Mortgage Backed Securities [Member] | Level 2 [Member] | Mortgage-backed Securities Agency [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 1,808 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 2,567 2,613
Asset backed [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 5,461 5,397
Asset backed [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 5,153 5,065
Asset backed [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 308 332
Other Debt Obligations [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 4,126 4,434
Other Debt Obligations [Member] | Level 2 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 4,035 4,347
Other Debt Obligations [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member]    
Assets    
Total debt securities 91 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