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Fair Value (Fair Value Option - Fair Value and Principal Balances) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Other Assets Fair Value [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | $ 62 | $ 132
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 59 | 125
Fair Value Option Aggregate Difference Assets | 3 | 7
Other Borrowed Funds [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value of liabilities for which fair value option was elected | 29 | 63
Aggregate Unpaid Principal Balance, Other borrowed funds | 29 | 64
Difference, Other borrowed funds |  | (1)
Residential Mortgage [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 831 | 819
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 797 | 798
Fair Value Option Aggregate Difference Assets | 34 | 21
Residential Mortgage [Member] | Loans [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1,031 | 742
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 1,325 | 865
Fair Value Option Aggregate Difference Assets | (294) | (123)
Residential Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 813 | 813
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 778 | 792
Fair Value Option Aggregate Difference Assets | 35 | 21
Residential Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 273 | 291
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 287 | 304
Fair Value Option Aggregate Difference Assets | (14) | (13)
Residential Mortgage [Member] | Loans 90 Days Or More Past Due [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 7 | 2
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 7 | 2
Residential Mortgage [Member] | Loans 90 Days Or More Past Due [Member] | Loans [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 233 | 285
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 244 | 296
Fair Value Option Aggregate Difference Assets | (11) | (11)
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 11 | 4
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 12 | 4
Fair Value Option Aggregate Difference Assets | (1) |
Residential Mortgage [Member] | Nonaccrual Loans [Member] | Loans [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 525 | 166
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 794 | 265
Fair Value Option Aggregate Difference Assets | (269) | (99)
Commercial Mortgage [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 404 | 246
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 417 | 265
Fair Value Option Aggregate Difference Assets | (13) | (19)
Commercial Mortgage [Member] | Loans Less Than 90 Days Past Due [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 403 | 245
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 416 | 263
Fair Value Option Aggregate Difference Assets | (13) | (18)
Commercial Mortgage [Member] | Nonaccrual Loans [Member] | Loans Held For Sale [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value - Assets | 1 | 1
Aggregate Unpaid Principal Balance Of Assets For Which Fair Value Option Was Elected | 1 | 2
Fair Value Option Aggregate Difference Assets |  | $ (1)

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