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Loans and the Allowance for Credit Losses (Analysis of the Allowance for Credit Losses by Portfolio Segment) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jan. 01, 2020
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan losses, beginning of period | $ 1,976,000,000 | $ 1,560,000,000 | $ 2,167,000,000 | $ 869,000,000 |
Provision (credit) for loan and lease losses | (332,000,000) | 838,000,000 | (440,000,000) | 1,214,000,000 |
Loan losses: |  |  |  |  |
Charge-offs | (83,000,000) | (204,000,000) | (197,000,000) | (348,000,000) |
Recoveries | 36,000,000 | 22,000,000 | 67,000,000 | 43,000,000 |
Net loan losses | (47,000,000) | (182,000,000) | (130,000,000) | (305,000,000) |
Total allowance for loan losses | 1,597,000,000 | 2,276,000,000 | 1,597,000,000 | 2,276,000,000 |
Reserve For Unfunded Credit Commitments [Roll Forward] |  |  |  |  |
Reserve For Unfunded Credit Commitments, beginning of period | 92,000,000 | 105,000,000 | 126,000,000 | 45,000,000 |
Provision (credit) for unfunded credit losses | (5,000,000) | 44,000,000 | (39,000,000) | 41,000,000 |
Reserve For Unfunded Credit Commitments, end of period | 87,000,000 | 149,000,000 | 87,000,000 | 149,000,000 |
Allowance for Credit Losses, end of period | 1,684,000,000 | 2,425,000,000 | 1,684,000,000 | 2,425,000,000 |
Unfunded credit commitments, Change in Method, Credit Loss Expense |  |  |  |  | $ 63,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) |  |  |  |  | 438,000,000
Portion of ending allowance for loan losses: |  |  |  |  |
Total allowance for loan losses | 1,597,000,000 | 2,276,000,000 | 1,597,000,000 | 2,276,000,000 |
Portion of loan portfolio ending balance: |  |  |  |  |
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL |  |  |  |  | 1,307,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL |  |  |  |  | 108,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | (60,000,000) |  | (60,000,000) |
Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan losses, beginning of period | 1,082,000,000 | 721,000,000 | 1,196,000,000 | 537,000,000 |
Provision (credit) for loan and lease losses | (203,000,000) | 622,000,000 | (286,000,000) | 873,000,000 |
Loan losses: |  |  |  |  |
Charge-offs | (36,000,000) | (142,000,000) | (83,000,000) | (213,000,000) |
Recoveries | 15,000,000 | 10,000,000 | 31,000,000 | 17,000,000 |
Net loan losses | (21,000,000) | (132,000,000) | (52,000,000) | (196,000,000) |
Total allowance for loan losses | 858,000,000 | 1,271,000,000 | 858,000,000 | 1,271,000,000 |
Reserve For Unfunded Credit Commitments [Roll Forward] |  |  |  |  |
Reserve For Unfunded Credit Commitments, beginning of period | 67,000,000 | 73,000,000 | 97,000,000 | 41,000,000 |
Provision (credit) for unfunded credit losses | (6,000,000) | 34,000,000 | (36,000,000) | 30,000,000 |
Reserve For Unfunded Credit Commitments, end of period | 61,000,000 | 107,000,000 | 61,000,000 | 107,000,000 |
Allowance for Credit Losses, end of period | 919,000,000 | 1,378,000,000 | 919,000,000 | 1,378,000,000 |
Unfunded credit commitments, Change in Method, Credit Loss Expense |  |  |  |  | 36,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) |  |  |  |  | (3,000,000)
Portion of ending allowance for loan losses: |  |  |  |  |
Total allowance for loan losses | 858,000,000 | 1,271,000,000 | 858,000,000 | 1,271,000,000 |
Portion of loan portfolio ending balance: |  |  |  |  |
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL |  |  |  |  | 534,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL |  |  |  |  | 77,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | (60,000,000) |  | (60,000,000) |
Total Investor Real Estate [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan losses, beginning of period | 150,000,000 | 63,000,000 | 183,000,000 | 45,000,000 |
Provision (credit) for loan and lease losses | (57,000,000) | 97,000,000 | (75,000,000) | 107,000,000 |
Loan losses: |  |  |  |  |
Charge-offs | (4,000,000) | 0 | (19,000,000) | 0 |
Recoveries | 2,000,000 | 0 | 2,000,000 | 1,000,000 |
Net loan losses | (2,000,000) | 0 | (17,000,000) | 1,000,000 |
Total allowance for loan losses | 91,000,000 | 160,000,000 | 91,000,000 | 160,000,000 |
Reserve For Unfunded Credit Commitments [Roll Forward] |  |  |  |  |
Reserve For Unfunded Credit Commitments, beginning of period | 11,000,000 | 18,000,000 | 14,000,000 | 4,000,000 |
Provision (credit) for unfunded credit losses | 2,000,000 | 9,000,000 | (1,000,000) | 10,000,000 |
Reserve For Unfunded Credit Commitments, end of period | 13,000,000 | 27,000,000 | 13,000,000 | 27,000,000 |
Allowance for Credit Losses, end of period | 104,000,000 | 187,000,000 | 104,000,000 | 187,000,000 |
Unfunded credit commitments, Change in Method, Credit Loss Expense |  |  |  |  | 13,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) |  |  |  |  | 7,000,000
Portion of ending allowance for loan losses: |  |  |  |  |
Total allowance for loan losses | 91,000,000 | 160,000,000 | 91,000,000 | 160,000,000 |
Portion of loan portfolio ending balance: |  |  |  |  |
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL |  |  |  |  | 52,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL |  |  |  |  | 17,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 0 |  | 0 |
Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Allowance for loan losses, beginning of period | 744,000,000 | 776,000,000 | 788,000,000 | 287,000,000 |
Provision (credit) for loan and lease losses | (72,000,000) | 119,000,000 | (79,000,000) | 234,000,000 |
Loan losses: |  |  |  |  |
Charge-offs | (43,000,000) | (62,000,000) | (95,000,000) | (135,000,000) |
Recoveries | 19,000,000 | 12,000,000 | 34,000,000 | 25,000,000 |
Net loan losses | (24,000,000) | (50,000,000) | (61,000,000) | (110,000,000) |
Total allowance for loan losses | 648,000,000 | 845,000,000 | 648,000,000 | 845,000,000 |
Reserve For Unfunded Credit Commitments [Roll Forward] |  |  |  |  |
Reserve For Unfunded Credit Commitments, beginning of period | 14,000,000 | 14,000,000 | 15,000,000 | 0 |
Provision (credit) for unfunded credit losses | (1,000,000) | 1,000,000 | (2,000,000) | 1,000,000 |
Reserve For Unfunded Credit Commitments, end of period | 13,000,000 | 15,000,000 | 13,000,000 | 15,000,000 |
Allowance for Credit Losses, end of period | 661,000,000 | 860,000,000 | 661,000,000 | 860,000,000 |
Unfunded credit commitments, Change in Method, Credit Loss Expense |  |  |  |  | 14,000,000
Accounts Receivable, Change in Method, Credit Loss Expense (Reversal) |  |  |  |  | 434,000,000
Portion of ending allowance for loan losses: |  |  |  |  |
Total allowance for loan losses | $ 648,000,000 | 845,000,000 | $ 648,000,000 | 845,000,000 |
Portion of loan portfolio ending balance: |  |  |  |  |
Loan and Lease Receivable, Allowance, Beginning Balance as adjusted for CECL |  |  |  |  | 721,000,000
Reserve For Unfunded Credit Commitments, Beginning Balance as adjusted for CECL |  |  |  |  | $ 14,000,000
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | $ 0 |  | $ 0 |

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