v3.22.0.1
Derivative Financial Instruments and Hedging Activities Derivative Financial Instruments and Hedging Activities (Schedule of Fair Value Hedging Basis Adjustments) (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge, Last-of-Layer, Amount $ 5,800,000,000  
Closed Portfolio and Beneficial Interest, Last-of-Layer, Amortized Cost 9,100,000,000  
Designated as Hedging Instrument [Member] | Debt Available-for-Sale Securities [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Asset, Fair Value Hedge 9,901,000,000 $ 0
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) 0 0
Designated as Hedging Instrument [Member] | Long-term Debt [Member]    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Hedged Liability, Fair Value Hedge (1,363,000,000) (2,171,000,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) $ 34,000,000 $ (64,000,000)