Credit Losses on Financial Instruments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	$ 95
Provision for expected losses	90
Write-offs charged against the allowance	(81)
Recoveries collected	22
Foreign currency exchange rate changes adjustment	(2)
Ending balance at June 30, 2020	124
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	58
Provision for expected losses	54
Write-offs charged against the allowance	(37)
Recoveries collected	11
Foreign currency exchange rate changes adjustment	(2)
Ending balance at June 30, 2020	84
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	37
Provision for expected losses	36
Write-offs charged against the allowance	(44)
Recoveries collected	11
Foreign currency exchange rate changes adjustment	0
Ending balance at June 30, 2020	$ 40