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	$ 95
Provision for expected losses	189
Write-offs charged against the allowance	(133)
Recoveries collected	42
Foreign currency exchange rate changes adjustment	(2)
Ending balance at December 31, 2020	191
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	58
Provision for expected losses	115
Write-offs charged against the allowance	(74)
Recoveries collected	24
Foreign currency exchange rate changes adjustment	(2)
Ending balance at December 31, 2020	121
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance at January 1, 2020	37
Provision for expected losses	74
Write-offs charged against the allowance	(59)
Recoveries collected	18
Foreign currency exchange rate changes adjustment	0
Ending balance at December 31, 2020	$ 70