Summary of Significant Accounting Policies Revenue Recognition (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Restricted Cash	$ 162	$ 167
Other Non-current Assets	97	73
Total Accounts Receivables, Net	$ 825	$ 826
Minimum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Product warranty period	1 year
Maximum
Revenue Recognition, Multiple-deliverable Arrangements [Line Items]
Product warranty period	5 years