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Short-Term and Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long-term debt $ 19,730,000,000 $ 19,718,000,000
Debt, Current $ 867,000,000 925,000,000
Document Period End Date Mar. 31, 2021  
Amounts drawn on credit facilities $ 0  
Assets Under Set-Off Arrangements    
Debt Instrument [Line Items]    
Long-term debt 10,264,000,000 10,464,000,000
Debt, Current 250,000,000 500,000,000
Junior Subordinated Debt    
Debt Instrument [Line Items]    
Long-term debt 7,613,000,000 7,615,000,000
Parent Company    
Debt Instrument [Line Items]    
Long-term debt 18,565,000,000 18,561,000,000
Debt, Current 425,000,000 424,000,000
Parent Company | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Long-term debt 7,556,000,000 7,554,000,000
Subsidiaries | Junior Subordinated Debt    
Debt Instrument [Line Items]    
Long-term debt 57,000,000 60,000,000
Long-term debt    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 712,000,000 1,027,000,000
Long-term debt | Senior notes    
Debt Instrument [Line Items]    
Long-term Debt, Current Maturities 400,000,000 399,000,000
Fed Funds Effective Rate Overnight Index Swap Rate | Senior notes    
Debt Instrument [Line Items]    
Long-term debt 11,182,000,000 11,179,000,000
Fed Funds Effective Rate Overnight Index Swap Rate | Mortgages    
Debt Instrument [Line Items]    
Long-term debt $ 24,000,000 $ 24,000,000