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	$ 95
Provision for expected losses	137
Write-offs charged against the allowance	(105)
Recoveries collected	31
Foreign currency exchange rate changes adjustment	(2)
Ending balance at September 30, 2020	156
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	58
Provision for expected losses	82
Write-offs charged against the allowance	(53)
Recoveries collected	18
Foreign currency exchange rate changes adjustment	(2)
Ending balance at September 30, 2020	103
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	37
Provision for expected losses	55
Write-offs charged against the allowance	(52)
Recoveries collected	13
Foreign currency exchange rate changes adjustment	0
Ending balance at September 30, 2020	$ 53