Credit Losses on Financial Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 191	$ 95
Provision for expected losses	105	189
Write-offs charged against the allowance	(177)	(133)
Recoveries collected	19	42
Reclassified as held for sale	(24)
Foreign currency exchange rate changes adjustment		(2)
Ending balance	114	191
Previously Reported
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	191
Ending balance		191
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		11
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	109	58
Provision for expected losses	50	115
Write-offs charged against the allowance	(76)	(74)
Recoveries collected	13	24
Reclassified as held for sale	(8)
Foreign currency exchange rate changes adjustment		(2)
Ending balance	88	109
Business | Previously Reported
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	121
Ending balance		121
Business | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12
Ending balance		12
Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	82
Provision for expected losses	55
Write-offs charged against the allowance	(101)
Recoveries collected	6
Reclassified as held for sale	(16)
Ending balance	26	82
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		37
Provision for expected losses		74
Write-offs charged against the allowance		(59)
Recoveries collected		18
Foreign currency exchange rate changes adjustment		0
Consumer | Previously Reported
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	70
Ending balance		70
Consumer | Revision of Prior Period, Reclassification, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 70
Ending balance		$ 70