Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Summary of Activity of Allowance For Doubtful Accounts) (Details)

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Summary of Significant Accounting Policies (Summary of Activity of Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance for doubtful accounts      
Beginning balance $ 199 $ 221 $ 154
Bad debt expense 83 127 125
Write-offs (114) (149) (58)
Ending balance $ 168 $ 199 $ 221