Credit Losses on Financial Instruments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	$ 18
Provision for expected losses	34
Write-offs charged against the allowance	(21)
Recoveries collected	8
Foreign currency exchange rate changes adjustment	(2)
Ending balance at September 30, 2020	$ 37