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Summary of Significant Accounting Policies - Credit Losses Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items]      
Provision (income) for credit losses $ 251 $ 11 $ 698
Winter Storm Uri      
Summary of Significant Accounting Policies [Line Items]      
Provision (income) for credit losses   $ (126) $ 596