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Fair Value (Carrying amount and estimated fair value of financial instrument assets and liabilities which are not measured at fair value) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets    
Mortgage loans $ 1,040 $ 973
Liabilities    
Long term debt 2,538 2,779
Carrying Amount    
Assets    
Mortgage loans 1,040 973
Liabilities    
Short term debt 243 0
Long term debt 2,538 2,779
Estimated Fair Value    
Assets    
Mortgage loans 973 1,018
Liabilities    
Short term debt 248 0
Long term debt 2,349 2,978
Level 1 | Estimated Fair Value    
Assets    
Mortgage loans 0 0
Liabilities    
Short term debt 0 0
Long term debt 0 0
Level 2 | Estimated Fair Value    
Assets    
Mortgage loans 0 0
Liabilities    
Short term debt 248 0
Long term debt 2,349 2,978
Level 3 | Estimated Fair Value    
Assets    
Mortgage loans 973 1,018
Liabilities    
Short term debt 0 0
Long term debt $ 0 $ 0