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Fair Value (Fair Value Option - Changes in Fair Value) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Loans Held For Sale [Member] | Residential Mortgage [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ 52 | $ 20 | $ 98 | $ 34
Loans Held For Sale [Member] | Commercial Mortgages [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 12 | 18 | 60 | 23
Loans [Member] | Residential Mortgage [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (Losses) - FVO: Changes in Fair Value | 8 | 5 | 26 | 9
Other Assets Fair Value [Member] |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |
Gains (Losses) - FVO: Changes in Fair Value | $ 9 | $ 12 | $ (27) | $ 21

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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