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Fair Value (Fair Value Measurements- Recurring Quantitative Information) (Details) - Fair Value, Recurring [Member]
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 114,311 $ 82,227
Financial and nonfinancial liabilities, fair value disclosure (5,315) (2,674)
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, recurring, fair value disclosure 4,900 5,400
Recurring Assets - Fair Value 4,938 5,395
Financial and nonfinancial liabilities, fair value disclosure (296) (344)
Total Recurring Assets Net of Recurring Liabilities - Fair Value 4,642 5,051
Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgages [Member] | Discounted Cash Flow, Spread Over the Benchmark Curve [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 60 $ 64
Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 6.30% 5.30%
Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 38.70% 29.35%
Level 3 [Member] | Loans Held For Sale [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 24.44% 18.89%
Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 210 $ 240
Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 4.33% 2.15%
Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 1,491 $ 1,741
Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 3.27% 1.88%
Level 3 [Member] | Loans - Residential real estate [Member] | Discounted Cash Flow [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 80 $ 72
Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 436 $ 184
Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative default rate 3.60% 3.60%
Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative default rate 100.00% 100.00%
Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative default rate 78.40% 76.70%
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 23 $ 44
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 3.60% 0.00%
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 100.00% 99.00%
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 91.40% 63.40%
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 68  
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing1 [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 17.10%  
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing1 [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 97.00%  
Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing1 [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit and Liquidity discount 57.40%  
Level 3 [Member] | Equity Investments [Member] | Multiple Of Adjusted Earnings [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 1,183 $ 1,276
Level 3 [Member] | Equity Investments [Member] | Multiple Of Adjusted Earnings [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multiple of earnings 5.0 5.0
Level 3 [Member] | Equity Investments [Member] | Multiple Of Adjusted Earnings [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multiple of earnings 16.5 16.5
Level 3 [Member] | Equity Investments [Member] | Multiple Of Adjusted Earnings [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Multiple of earnings 8.5 8.5
Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 577 $ 995
Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 3.31% 3.20%
Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 37.93% 14.35%
Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Spread over the benchmark curve 9.12% 7.69%
Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 490 $ 649
Level 3 [Member] | Derivative [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financial and nonfinancial liabilities, fair value disclosure $ (171) $ (176)
Estimated growth rate of Visa Class A share price 16.00% 16.00%
Fair Value Inputs Length Of Litigation Resolution Date 6/30/2021 3/31/2021
Level 3 [Member] | Derivative [Member] | Visa Class B Swap [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
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% 162.30%
Level 3 [Member] | Insignificant Assets, Net of Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Recurring Assets - Fair Value $ 195  
Financial and nonfinancial liabilities, fair value disclosure   $ (38)
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.010 0.010
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.220 0.220
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.075 0.075
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.010 0.010
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.376 0.362
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.086 0.099
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Minimum [Member]    
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 [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.652 0.538
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Residential Mortgage [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.276 0.135
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.038 0.035
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.221 0.181
Measurement Input, Constant Prepayment Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.048 0.046
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.010 0.010
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.072 0.072
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.033 0.034
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.000 0.000
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.159 0.141
Measurement Input, Constant Default Rate [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.047 0.043
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.300 0.300
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 1.000 1.000
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Asset backed [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.589 0.576
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.250 0.266
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.957 0.957
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Available-for-sale Securities [Member] | Residential Mortgage-backed Securities [Member] | Priced By A Third Party Vendor Using Discounted Cash Flow Pricing Model [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Constant prepayment rate (CPR) 0.486 0.519
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.080 0.080
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.000 0.000
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 1.000 1.000
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.127 0.145
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.000  
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.994  
Measurement Input, Loss Severity [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.371  
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.033 0.048
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.048 0.050
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.068 0.080
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Residential real estate [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.053 0.052
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.048  
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.068  
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Loans - Home equity [Member] | Consensus Pricing [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans, Measurement Input 0.063  
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.040 0.056
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.080 0.081
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Mortgage Servicing Rights [Member] | Commercial Mortgages [Member] | Discounted Cash Flow [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Servicing asset, measurement input 0.074 0.079