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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Allowance for credit losses $ 3,649 $ 1,729
Rewards programs 711 579
Lease liabilities 396 407
Net operating loss and tax credit carryforwards 314 284
Compensation and employee benefits 306 301
Partnership investments 237 202
Unearned income 117 95
Goodwill and intangibles 116 161
Fixed assets and leases 42 0
Other assets 143 142
Subtotal 6,031 3,900
Valuation allowance (296) (223)
Total deferred tax assets 5,735 3,677
Deferred tax liabilities:    
Security and loan valuations 805 234
Original issue discount 481 600
Net unrealized gains on derivatives 387 93
Right-of-use assets 342 393
Partnership investments 142 147
Mortgage servicing rights 73 55
Loan fees and expenses 36 100
Fixed assets and leases 0 189
Other liabilities 143 146
Total deferred tax liabilities 2,409 1,957
Net deferred tax assets $ 3,326 $ 1,720