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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Allowance for doubtful accounts      
Beginning balance $ 221 $ 154 $ 104
Bad debt expense 127 125 100
Write-offs (149) (58) (51)
Translation and other adjustments 0 0 1
Ending balance $ 199 $ 221 $ 154