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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

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