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Business Combinations - Assets Acquired and Liabilities Asssumed (Details) - USD ($)
$ in Millions
Dec. 06, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Goodwill   $ 24,447 $ 24,154 $ 9,818 $ 9,618
SunTrust Banks Inc.          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred $ 33,547        
Trading assets 5,710        
AFS securities 30,986        
LHFS 3,752        
UPB Loans 158,495        
Fair Value Loans 154,033        
Premises and equipment 1,496        
CDI and other intangible assets 2,734        
MSRs 1,605        
Other assets 13,646        
Total assets 221,442        
Deposits (170,633)        
Short-term borrowings (6,837)        
Long-term debt (19,484)        
Other liabilities (5,011)        
Total liabilities (201,965)        
Noncontrolling interest (108)        
Less: Net assets 19,369        
Goodwill 14,178        
SunTrust Banks Inc. | Cash and due from banks          
Business Acquisition [Line Items]          
Cash and Equivalents 1,621        
SunTrust Banks Inc. | Interest-bearing deposits with banks          
Business Acquisition [Line Items]          
Cash and Equivalents 4,668        
SunTrust Banks Inc. | Securities borrowed or purchased under resale agreements          
Business Acquisition [Line Items]          
Cash and Equivalents 1,191        
SunTrust Banks Inc. | Commercial and industrial          
Business Acquisition [Line Items]          
UPB Loans 68,687        
Fair Value Loans 67,101        
SunTrust Banks Inc. | CRE          
Business Acquisition [Line Items]          
UPB Loans 9,509        
Fair Value Loans 9,357        
SunTrust Banks Inc. | Commercial construction          
Business Acquisition [Line Items]          
UPB Loans 2,136        
Fair Value Loans 2,096        
SunTrust Banks Inc. | Lease financing          
Business Acquisition [Line Items]          
UPB Loans 3,967        
Fair Value Loans 3,743        
SunTrust Banks Inc. | Residential Mortgage          
Business Acquisition [Line Items]          
UPB Loans 28,191        
Fair Value Loans 27,180        
SunTrust Banks Inc. | Residential home equity and direct          
Business Acquisition [Line Items]          
UPB Loans 15,917        
Fair Value Loans 15,628        
SunTrust Banks Inc. | Indirect auto          
Business Acquisition [Line Items]          
UPB Loans 12,373        
Fair Value Loans 12,203        
SunTrust Banks Inc. | Indirect other          
Business Acquisition [Line Items]          
UPB Loans 4,678        
Fair Value Loans 4,445        
SunTrust Banks Inc. | Student          
Business Acquisition [Line Items]          
UPB Loans 6,867        
Fair Value Loans 6,657        
SunTrust Banks Inc. | Credit card          
Business Acquisition [Line Items]          
UPB Loans 2,518        
Fair Value Loans 2,497        
SunTrust Banks Inc. | PCI          
Business Acquisition [Line Items]          
UPB Loans 3,652        
Fair Value Loans $ 3,126