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Derivatives and Hedging Activities - Derivative Instrument Cash Flow Hedge Earning Recognized by Income Statement Location (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | $ 440,000,000 | $ 9,000,000 | $ (77,000,000)
Net Gains (Losses) Reclassified From OCI Into Income | 46,000,000 | (37,000,000) | 15,000,000
Net Gains (Losses) Recognized in Other Income | 0 | 0 | 0
Interest Income [Member] | Interest Rate [Member] | Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | 442,000,000 | (13,000,000) | (59,000,000)
Net Gains (Losses) Reclassified From OCI Into Income | 15,000,000 | (68,000,000) | 19,000,000
Net Gains (Losses) Recognized in Other Income | 0 | 0 | 0
Interest Expense [Member] | Interest Rate [Member] | Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | (1,000,000) | 2,000,000 | 0
Net Gains (Losses) Reclassified From OCI Into Income | (1,000,000) | (2,000,000) | (4,000,000)
Net Gains (Losses) Recognized in Other Income | 0 | 0 | 0
Investment Banking and Debt Placement Fees [Member] | Interest Rate [Member] | Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | 3,000,000 | 1,000,000 | (1,000,000)
Net Gains (Losses) Reclassified From OCI Into Income | 0 | 2,000,000 | 0
Net Gains (Losses) Recognized in Other Income | 0 | 0 | 0
Other Income [Member] | Foreign Exchange Contract [Member] | Net Investment Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Net Gains (Losses) Recognized in OCI | (4,000,000) | 19,000,000 | (17,000,000)
Net Gains (Losses) Reclassified From OCI Into Income | 32,000,000 | 31,000,000 | 0
Net Gains (Losses) Recognized in Other Income | $ 0 | $ 0 | $ 0

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109974929&loc=SL110061190-113977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e637-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 + Details
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