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Fair Value Measurements (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Goodwill, Impairment Loss $ 0 $ 0
Fair Value, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impairment of assets measured at fair value on a non-recurring basis   59,000,000
Residential Mortgage-Backed Securities - Agency [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities, par value $ 309,000,000 $ 309,000,000
Available for sale securities, weighted average coupon rate (in percent) 2.81% 2.81%
Available for sale securities, weighted average remaining maturity (in years)   3 years
Securities Held as Collateral, at Fair Value $ 10,700,000,000 $ 10,700,000,000