Nature of Operations and Summary of Significant Accounting Policies - Contract Assets, Receivables, and Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 3,226	$ 2,465
Trade receivables before allowance for credit loss	$ 2,229		$ 1,952
Percentage of outstanding receivables less than 90 days	91.00%
Trade receivables	$ 2,160		$ 1,906