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Debt (Schedule Of Short-Term Debt And Current Portion Of Long-Term Debt) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Unsecured debt $ 1,448 $ 1,099
Non-recourse debt and notes 15 21
Finance lease obligations 65 71
Commercial paper   6,109
Other notes 165 40
Short-term debt and current portion of long-term debt $ 1,693 $ 7,340