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Short-Term and Long-Term Debt (Senior Notes and Mortgage Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Medium-term Notes    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount $ 8,378 $ 8,548
Medium-term Notes | Senior notes    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount 10,269 10,496
Senior notes    
Debt Instrument [Line Items]    
Debt, Long-term and Short-term, Combined Amount 1,484 1,476
Short-term Debt 0 173
Retail Medium Term Note    
Debt Instrument [Line Items]    
Outstanding amount of notes 249 264
Mortgages | Senior notes    
Debt Instrument [Line Items]    
Long-term Debt 158 $ 208
Short-term Debt $ 83