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Fair Value Disclosures (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis The following tables present fair value information for assets and liabilities measured at fair value on a recurring basis:
December 31, 2021
(Dollars in millions)		TotalLevel 1Level 2Level 3Netting Adjustments (1)
Assets:    
Trading assets:
U.S. Treasury$125 $— $125 $— $— 
GSE306 — 306 — — 
Agency MBS - residential1,016 — 1,016 — — 
Agency MBS - commercial13 — 13 — — 
States and political subdivisions91 — 91 — — 
Corporate and other debt securities738 — 738 — — 
Loans1,791 — 1,791 — — 
Other343 285 58 — — 
Total trading assets4,423 285 4,138 — — 
AFS securities: 
U.S. Treasury9,795 — 9,795 — — 
GSE1,698 — 1,698 — — 
Agency MBS - residential134,042 — 134,042 — — 
Agency MBS - commercial2,882 — 2,882 — — 
States and political subdivisions420 — 420 — — 
Non-agency MBS4,258 — 4,258 — — 
Other28 — 28 — — 
Total AFS securities153,123 — 153,123 — — 
LHFS at fair value3,544 — 3,544 — — 
Loans and leases23 — — 23 — 
Loan servicing rights at fair value2,633 — — 2,633 — 
Other assets:
Derivative assets2,370 887 3,110 30 (1,657)
Equity securities1,066 967 99 — — 
Total assets$167,182 $2,139 $164,014 $2,686 $(1,657)
Liabilities:    
Derivative liabilities$586 $438 $3,056 $42 $(2,950)
Securities sold short1,731 8 1,723 — — 
Total liabilities$2,317 $446 $4,779 $42 $(2,950)
December 31, 2020
(Dollars in millions)		TotalLevel 1Level 2Level 3Netting Adjustments (1)
Assets:    
Trading assets:
U.S. Treasury$793 $— $793 $— $— 
GSE164 — 164 — — 
Agency MBS - residential599 — 599 — — 
Agency MBS - commercial21 — 21 — — 
States and political subdivisions34 — 34 — — 
Corporate and other debt securities545 — 545 — — 
Loans1,586 — 1,586 — — 
Other130 123 7 — — 
Total trading assets3,872 123 3,749 — — 
AFS securities:    
U.S. Treasury1,746 — 1,746 — — 
GSE1,917 — 1,917 — — 
Agency MBS - residential113,541 — 113,541 — — 
Agency MBS - commercial3,057 — 3,057 — — 
States and political subdivisions493 — 493 — — 
Other34 — 34 — — 
Total AFS securities120,788 — 120,788 — — 
LHFS at fair value4,955 — 4,955 — — 
Loan servicing rights at fair value2,023 — — 2,023 — 
Other assets:    
Derivative assets3,837 752 4,903 186 (2,004)
Equity securities1,054 996 58 — — 
Total assets$136,529 $1,871 $134,453 $2,209 $(2,004)
Liabilities:    
Derivative liabilities$555 $386 $3,263 $14 $(3,108)
Securities sold short1,115 3 1,112 — — 
Total liabilities$1,670 $389 $4,375 $14 $(3,108)
(1)Refer to “Note 19. Derivative Financial Instruments” for additional discussion on netting adjustments.
Rollforward of Level 3 Assets and Liabilities Activity for Level 3 assets and liabilities is summarized below:
 
(Dollars in millions)		Trading AssetsNon-agency MBSLoans and LeasesLoan Servicing RightsNet DerivativesPrivate Equity Investments
Balance at January 1, 2019$3 $391 $— $1,108 $12 $393 
Total realized and unrealized gains (losses):
Included in earnings— 13 — (105)63 47 
Included in unrealized net holding gains (losses) in OCI— 4 — — — — 
Purchases23 — — 31 (1)137 
Issuances— — — 170 63 — 
Sales(26)— — (27)— (91)
Settlements— (40)— (164)(118)(46)
Transfers into Level 3— — — — (10)— 
Merger additions— — — 1,605 10 — 
Balance at December 31, 2019— 368 — 2,618 19 440 
Total realized and unrealized gains (losses):   
Included in earnings— 306 — (550)467 2 
Included in unrealized net holding gains (losses) in OCI— (178)— — — — 
Purchases— — — — — 27 
Issuances— — — 711 780 — 
Sales— (481)— — — — 
Settlements— (15)— (756)(1,094)(21)
Transfers out of level 3 and other— — — — — (448)
Balance at December 31, 2020— — — 2,023 172 — 
Total realized and unrealized gains (losses):
Included in earnings— — (1)233 (96)— 
Included in unrealized net holding gains (losses) in OCI— — — — — — 
Purchases— — — 355 — — 
Issuances— — — 715 305 — 
Sales— — — (1)— — 
Settlements— — — (741)(393)— 
Acquisition— — 24 49 — — 
Balance at December 31, 2021$— $— $23 $2,633 $(12)$— 
Change in unrealized gains (losses) included in earnings for the period, attributable to assets and liabilities still held at December 31, 2021$— $— $(1)$234 $(8)$— 
Primary income statement location of realized gains (losses) included in earnings
Net interest incomeSecurities gains (losses)Other incomeResidential mortgage income and Commercial mortgage incomeResidential mortgage income and Commercial mortgage incomeOther income
Fair Value and UPB of LHFS The following table details the fair value and UPB of certain loans that were elected to be measured at fair value:
 December 31, 2021December 31, 2020
(Dollars in millions)Fair ValueUPBDifferenceFair ValueUPBDifference
Trading loans$1,791 $1,784 $7 $1,586 $1,619 $(33)
Loans and leases23 35 (12)— — — 
LHFS at fair value3,544 3,450 94 4,955 4,736 219 
Assets Measured at Fair Value on a Nonrecurring Basis
The following table provides information about certain assets measured at fair value on a nonrecurring basis still held as of period end. The carrying values represent end of period values, which approximate the fair value measurements that occurred on the various measurement dates throughout the period. These assets are considered to be Level 3 assets.
(Dollars in millions)Dec 31, 2021Dec 31, 2020
Carrying value:
LHFS$101 $979 
Loans and leases443 536 
Other100 92 

The following table provides information about valuation adjustments for certain assets measured at fair value on a nonrecurring basis. The valuation adjustments represent the amounts recorded during the period regardless of whether the asset is still held at period end.
Year Ended December 31,
(Dollars in millions)		202120202019
Valuation adjustments:
LHFS$(27)$(101)$(17)
Loans and leases(455)(731)(280)
Other(178)(175)(253)
Carrying Amounts and Fair Value of Financial Assets and Liabilities Not Recorded at Fair Value Financial assets and liabilities not recorded at fair value are summarized below:
December 31,
(Dollars in millions)		20212020
Fair Value HierarchyCarrying AmountFair ValueCarrying AmountFair Value
Financial assets:
HTM securitiesLevel 2$1,494 $1,495 $— $— 
Loans and leases HFI, net of ALLLLevel 3285,055 284,914 293,899 295,461 
Financial liabilities:  
Time depositsLevel 215,886 16,017 21,941 22,095 
Long-term debtLevel 235,913 36,251 39,597 40,864