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Derivative Financial Instruments and Hedging Activities (Schedule of Gains (Losses) Recognized Related to Derivatives Not Designated as Hedging Instruments) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ 12 | $ 83 | $ 14 | $ 162
Capital markets income |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 4 | 58 | 56 | 31
Capital markets income | Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (3) | 29 | 20 | (8)
Capital markets income | Interest Rate Options [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 2 | 16 | 17 | 32
Capital markets income | Interest Rate Futures And Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 3 | 2 | 12 | 7
Capital markets income | Other Contract [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 2 | 11 | 7 | 0
Mortgage Income [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 8 | 25 | (42) | 131
Mortgage Income [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | 29 | 6 | (38) | 104
Mortgage Income [Member] | Interest Rate Options [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | (2) | 2 | (15) | 26
Mortgage Income [Member] | Interest Rate Futures And Forward Commitments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) of Derivatives Not Designated as Hedging Instruments | $ (19) | $ 17 | $ 11 | $ 1

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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