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Fair Value of Assets and Liabilities Fair Value of Assets & Liabilities (Non-Recurring) (Details) - Nonconsolidated VIEs [Member] - Affordable housing partnerships [Member] - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Affordable housing partnerships, carrying value | $ 270 | $ 352
Nonrecurring basis [Member] | Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Affordable housing partnerships, carrying value | $ 158 | $ 112

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- Definition Carrying amount of the assets in the reporting entity's statement of financial position that relate to the reporting entity's variable interest in the Variable Interest Entity (VIE), where the reporting entity is not the VIE's primary beneficiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph a -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5728-111685 + Details
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