Credit Losses on Financial Instruments (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 67
Provision for expected losses	39
Write-offs charged against the allowance	(50)
Recoveries collected	6
Ending balance	62
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36
Provision for expected losses	13
Write-offs charged against the allowance	(19)
Recoveries collected	4
Ending balance	34
Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31
Provision for expected losses	26
Write-offs charged against the allowance	(31)
Recoveries collected	2
Ending balance	$ 28