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Asset Quality (Impaired Loans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Unpaid Principal Balance - Impaired Financing Receivable [Abstract] |  |
Unpaid principal balance - Impaired loans with an associated allowance | $ 1,229 | $ 1,303
Unpaid principal balance - Impaired loans without an associated allowance | 1,250 | 1,455
Unpaid principal balance - Total impaired loans | 2,479 | 2,758
Recorded Investment - Impaired Financing Receivable [Abstract] |  |
Recorded investment - Impaired loans with an associated allowance | 1,054 | 1,132
Recorded investment - Impaired loans without an associated allowance | 830 | 951
Recorded investment - Total impaired loans | 1,884 | 2,083
Associated Allowance - Total impaired loans | 191 | 209
Average Recorded Receivable - Impaired Financing Receivable [Abstract] |  |
Average recorded investment - Impaired loans with an associated allowance | 1,124 | 1,253
Average recorded investment - Impaired loans without an associated allowance | 899 | 939
Average recorded investment - Total impaired loans | 2,023 | 2,192
Total commercial lending |  |
Unpaid Principal Balance - Impaired Financing Receivable [Abstract] |  |
Unpaid principal balance - Impaired loans with an associated allowance | 527 | 440
Unpaid principal balance - Impaired loans without an associated allowance | 228 | 413
Recorded Investment - Impaired Financing Receivable [Abstract] |  |
Recorded investment - Impaired loans with an associated allowance | 386 | 315
Recorded investment - Impaired loans without an associated allowance | 195 | 326
Associated Allowance - Total impaired loans | 98 | 73
Average Recorded Receivable - Impaired Financing Receivable [Abstract] |  |
Average recorded investment - Impaired loans with an associated allowance | 371 | 349
Average recorded investment - Impaired loans without an associated allowance | 276 | 294
Total consumer lending |  |
Unpaid Principal Balance - Impaired Financing Receivable [Abstract] |  |
Unpaid principal balance - Impaired loans with an associated allowance | 702 | 863
Unpaid principal balance - Impaired loans without an associated allowance | 1,022 | 1,042
Recorded Investment - Impaired Financing Receivable [Abstract] |  |
Recorded investment - Impaired loans with an associated allowance | 668 | 817
Recorded investment - Impaired loans without an associated allowance | 635 | 625
Associated Allowance - Total impaired loans | 93 | 136
Average Recorded Receivable - Impaired Financing Receivable [Abstract] |  |
Average recorded investment - Impaired loans with an associated allowance | 753 | 904
Average recorded investment - Impaired loans without an associated allowance | $ 623 | $ 645

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