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Fair Value (Fair Value Measurements- Recurring Quantitative Information) (Details) - Fair Value, Measurements, Recurring $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 82,227 | $ 75,744
Financial and nonfinancial liabilities, fair value disclosure | (2,674) | (3,355)
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 5,395 | 6,157
Financial and nonfinancial liabilities, fair value disclosure | (344) | (333)
Recuring Assets, Net of Liabilities - Fair Value | 5,051 | 5,824
Assets, fair value disclosure | 5,400 | 6,100
Level 3 | Loans - Residential real estate | Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | 72 | 90
Level 3 | Loans - Residential real estate | Consensus Pricing |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 184 | $ 129
Level 3 | Loans - Residential real estate | Consensus Pricing | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cumulative default rate | 3.60% | 11.00%
Level 3 | Loans - Residential real estate | Consensus Pricing | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cumulative default rate | 100.00% | 100.00%
Level 3 | Loans - Residential real estate | Consensus Pricing | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cumulative default rate | 76.70% | 81.80%
Level 3 | Loans - Home equity | Consensus Pricing |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 44 | $ 53
Level 3 | Loans - Home equity | Consensus Pricing | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Credit and Liquidity discount | 0.00% | 0.00%
Level 3 | Loans - Home equity | Consensus Pricing | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Credit and Liquidity discount | 99.00% | 99.00%
Level 3 | Loans - Home equity | Consensus Pricing | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Credit and Liquidity discount | 63.40% | 61.30%
Level 3 | Equity investments | Multiple of Adjusted Earnings |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,276 | $ 1,255
Level 3 | Equity investments | Multiple of Adjusted Earnings | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Multiple of earnings | 5.0 | 4.5
Level 3 | Equity investments | Multiple of Adjusted Earnings | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Multiple of earnings | 16.5 | 16.0
Level 3 | Equity investments | Multiple of Adjusted Earnings | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Multiple of earnings | 8.5 | 8.4
Level 3 | Insignificant Assets, Net of Liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure |  | $ 35
Financial and nonfinancial liabilities, fair value disclosure | $ (38) |
Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 995 | $ 1,257
Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 3.20% | 4.92%
Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 14.35% | 14.55%
Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 7.69% | 8.06%
Commercial Mortgages | Level 3 | Loans Held For Sale | Discounted Cash Flow, Spread Over the Benchmark Curve |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 64 | $ 87
Commercial Mortgages | Level 3 | Loans Held For Sale | Discounted Cash Flow | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 5.30% | 5.35%
Commercial Mortgages | Level 3 | Loans Held For Sale | Discounted Cash Flow | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 23.95% | 19.00%
Commercial Mortgages | Level 3 | Loans Held For Sale | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 18.89% | 12.17%
Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 649 | $ 726
Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 1,741 | $ 2,128
Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 1.88% | 2.16%
Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets, Fair Value Disclosure | $ 240 | $ 274
Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Spread over the benchmark curve | 2.15% | 1.98%
Visa Class B Swap | Level 3 | Financial derivatives | Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial and nonfinancial liabilities, fair value disclosure | $ (176) | $ (210)
Estimated growth rate of Visa Class A share price | 16.00% | 16.00%
Estimated length of litigation resolution date | 3/30/2021 | 12/31/2020
Visa Class B Swap | Level 3 | Financial derivatives | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated conversion factor of Class B shares into Class A shares | 162.30% | 163.00%
Measurement Input, Constant Default Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.000 | 0.000
Measurement Input, Constant Default Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.141 | 0.188
Measurement Input, Constant Default Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.043 | 0.051
Measurement Input, Constant Default Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.010 | 0.010
Measurement Input, Constant Default Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.072 | 0.185
Measurement Input, Constant Default Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.034 | 0.040
Measurement Input, Loss Severity | Level 3 | Loans - Residential real estate | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.080 | 0.080
Measurement Input, Loss Severity | Level 3 | Loans - Residential real estate | Consensus Pricing | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.000 | 0.000
Measurement Input, Loss Severity | Level 3 | Loans - Residential real estate | Consensus Pricing | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 1.000 | 1.000
Measurement Input, Loss Severity | Level 3 | Loans - Residential real estate | Consensus Pricing | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.145 | 0.172
Measurement Input, Loss Severity | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.266 | 0.100
Measurement Input, Loss Severity | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.957 | 1.000
Measurement Input, Loss Severity | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.519 | 0.508
Measurement Input, Loss Severity | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.300 | 0.150
Measurement Input, Loss Severity | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.000 | 1.000
Measurement Input, Loss Severity | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.576 | 0.638
Measurement Input, Constant Prepayment Rate | Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.000 | 0.000
Measurement Input, Constant Prepayment Rate | Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.538 | 0.545
Measurement Input, Constant Prepayment Rate | Residential Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.135 | 0.087
Measurement Input, Constant Prepayment Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.035 | 0.046
Measurement Input, Constant Prepayment Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.181 | 0.147
Measurement Input, Constant Prepayment Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.046 | 0.057
Measurement Input, Constant Prepayment Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.010 | 0.010
Measurement Input, Constant Prepayment Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.362 | 0.330
Measurement Input, Constant Prepayment Rate | Residential mortgage-backed Securities | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.099 | 0.1180
Measurement Input, Constant Prepayment Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.010 | 0.010
Measurement Input, Constant Prepayment Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.220 | 0.190
Measurement Input, Constant Prepayment Rate | Asset backed | Level 3 | Securities available for sale | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.075 | 0.085
Measurement Input, Discount Rate | Level 3 | Loans - Residential real estate | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.048 | 0.058
Measurement Input, Discount Rate | Level 3 | Loans - Residential real estate | Consensus Pricing | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.050 | 0.055
Measurement Input, Discount Rate | Level 3 | Loans - Residential real estate | Consensus Pricing | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.080 | 0.083
Measurement Input, Discount Rate | Level 3 | Loans - Residential real estate | Consensus Pricing | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans, Measurement Input | 0.052 | 0.058
Measurement Input, Discount Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.056 | 0.069
Measurement Input, Discount Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.081 | 0.085
Measurement Input, Discount Rate | Commercial Mortgages | Level 3 | Mortgage Servicing Rights | Discounted Cash Flow | Weighted Average |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Servicing asset, measurement input | 0.079 | 0.084

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- Definition Adjustments to the discount rate used to measure fair value for both the lack of ability to convert business interests into cash quickly and the risk that a borrower will default on debt by failing to make required payments. + References No definition available. + Details
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- Definition Cumulative percentage of likelihood the pool of loans will not be repaid and instead default, used as an input to measure fair value. + References No definition available. + Details
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- Definition Percentage of Visa Class A shares to be received for Visa Class B shares upon conversion date, used as an input to measure fair value. + References No definition available. + Details
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- Definition Annual percentage price appreciation of Visa Class A shares, used as an input to measure fair value. + References No definition available. + Details
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- Definition Ratio of an entity's stock price to its earnings per share, as an integer. Price earnings (P/E) ratio is used as an input to measure fair value. + References No definition available. + Details
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- Definition The assumed yield spread over the benchmark curve for each instrument is generally intended to incorporate non-interest-rate risks such as credit and liquidity risks as an input to measure fair value. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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