Credit Losses on Financial Instruments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	$ 18
Provision for expected losses	41
Write-offs charged against the allowance	(23)
Recoveries collected	11
Foreign currency exchange rate changes adjustment	(2)
Ending balance at December 31, 2020	$ 45