Credit Losses on Financial Instruments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($)
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 67
Provision for expected losses	23
Write-offs charged against the allowance	(27)
Recoveries collected	4
Ending balance	67
Business
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	36
Provision for expected losses	8
Write-offs charged against the allowance	(10)
Recoveries collected	3
Ending balance	37
Mass Markets
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	31
Provision for expected losses	15
Write-offs charged against the allowance	(17)
Recoveries collected	1
Ending balance	$ 30