Credit Losses on Financial Instruments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	$ 95
Current Period provision for expected losses	35
Write-offs charged against the allowance	(43)
Recoveries collected	13
Foreign currency exchange rate change adjustment	(1)
Ending Balance at March 31, 2020	99
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	58
Current Period provision for expected losses	18
Write-offs charged against the allowance	(19)
Recoveries collected	6
Foreign currency exchange rate change adjustment	(1)
Ending Balance at March 31, 2020	62
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	37
Current Period provision for expected losses	17
Write-offs charged against the allowance	(24)
Recoveries collected	7
Foreign currency exchange rate change adjustment	0
Ending Balance at March 31, 2020	$ 37