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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles The main drivers of the adjustment to retained earnings are summarized in the following table.
Pre-ASC 326 AdoptionImpact of ASC 326 AdoptionAs Reported Under ASC 326
in millionsDecember 31, 2019January 1, 2020
Allowance for credit losses
Commercial
Commercial and industrial $551 $(141)$410 
Real estate — commercial mortgage143 16 159 
Real estate — construction22 (7)15 
Commercial lease financing35 43 
Total commercial loans751 (124)627 
Consumer
Real estate — residential mortgage77 84 
Home equity loans31 147 178 
Consumer direct loans34 63 97 
Credit cards47 35 82 
Consumer indirect loans30 36 
Total consumer loans149 328 477 
Total ALLL — continuing operations900 204 1,104 
Discontinued operations10 31 41 
Total ALLL910 235 1,145 
Accrued expense and other liabilities75 70 145 
Total allowance for credit losses$985 $305 $1,290 
Accounting Guidance Adopted in 2021
StandardDate of AdoptionDescriptionEffect on Financial Statements or Other Significant Matters
ASU 2019-12, Simplifying the
Accounting for
Income Taxes
January 1, 2021

This ASU simplifies the accounting for income taxes by removing certain exceptions to the existing guidance, such as exceptions related to the incremental approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period when a
year-to-date loss exceeds the anticipated loss, and the recognition of deferred tax liabilities when a foreign subsidiary becomes an equity method investment and when a foreign equity method investment becomes a subsidiary.

Along with general improvements, it adds simplifications related to franchise taxes, the tax basis of goodwill, and the method for recognizing an enacted change in tax laws. The guidance also specifies that an entity is
not required to allocate the consolidated amount of certain tax expense to a legal entity not subject to tax in its own separate financial statements.

The guidance should be applied on either a retrospective, modified retrospective, or prospective basis depending on the amendment.
Key adopted this guidance on January 1, 2021 using the transition guidance prescribed by amendment. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
ASU 2020-01,
Clarifying the
Interactions
between Topic
321,Investments
—Equity
Securities;
Topic 323,
Investments—
Equity Method
and Joint
Ventures; and
Topic 815,
Derivatives and
Hedging
January 1, 2021
This guidance clarifies that when applying the measurement alternative in Topic 321, companies should consider certain observable transactions that require the application or discontinuance of the equity method under Topic 323.

It also clarifies that companies should not consider whether the underlying securities in certain forward contracts and purchased options would be accounted for under the equity method or fair value option when determining the method of accounting for those contracts.

This guidance should be applied on a prospective basis.
Key adopted this guidance on January 1, 2021 on a prospective basis. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
ASU 2020-08,
Codification
Improvements to
Subtopic 310-20,
Receivables—
Nonrefundable
Fees and Other
Costs
January 1, 2021This ASU clarifies that at each reporting period an entity should reevaluate whether a callable debt security is within the scope of ASC 310, which says that to the extent the amortized cost basis of an individual callable debt security exceeds the amount repayable by the
issuer at the earliest call date, the premium shall be amortized to the earliest call date, unless prepayment guidance is applied.

This guidance should be applied on a prospective basis.
Key adopted this guidance on January 1, 2021 on a prospective basis. The adoption of this accounting guidance is not expected to have a material effect on our financial condition or results of operations.
ASU 2021-01, Reference Rate Reform (Topic 848)January 1, 2021The ASU clarifies that certain optional expedients and exceptions related to contracts modified as a result of reference rate reform and hedge accounting apply to derivatives affected by the discounting transition, such as those that use an interest rate for margining, discounting, or contract price alignment.

The guidance may be applied on a full retrospective basis as of any date from the beginning of an interim period that includes or is subsequent to March 12, 2020,

Alternatively, it may be applied on a prospective basis to new modifications from any date within an interim period that includes or is subsequent to the date of the issuance of a final Update, until the financial statements are available to be issued.
Key adopted this guidance on January 1, 2021 on a prospective basis and will assess the impact in conjunction with the reference rate transition as it occurs over the next two years.