Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details)

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Summary of Significant Accounting Policies (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Accounts Receivable, Allowance for Credit Loss, Beginning Balance $ 72 $ 47 $ 52
Provision for doubtful accounts 21 37 16
Accounts Receivable, Allowance for Credit Loss, Writeoff (12) (24) (21)
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 81 $ 72 $ 47