Accounts Receivable - Activity of Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 114	$ 191	$ 106
Additions	133	105	189
Deductions	(162)	(182)	(104)
Ending Balance	85	114	191	$ 106
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity	10,437	11,840	11,162
Income tax expense	557	668	450
Retained Earnings (Accumulated Deficit)
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity	$ (7,546)	$ (5,998)	$ (8,031)	(6,814)
Income tax expense				2
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings (Accumulated Deficit)
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' equity				9
Income tax expense				$ 2