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Financial Derivatives (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Derivative [Line Items]    
Cash and securities held to collateralize net derivative assets $ 1,600,000,000  
Cash and securities pledged to collateralize net derivative liabilities 4,600,000,000  
Cash flow hedges | Interest Rate Contracts    
Derivative [Line Items]    
Cash flow hedge loss to be reclassified within twelve months 816,000,000  
Cash flow hedge loss to be reclassified within twelve months, net of tax $ 628,000,000  
Maximum length of time hedged in cash flow hedge 10 years  
Net investment hedges | Foreign exchange contracts:    
Derivative [Line Items]    
Gain (loss) from components excluded from assessment of net investment hedge effectiveness net $ 0 $ 0