Restructuring and Transaction Costs - Summary of The Activity And Balances Associated With Restructuring Liabilities (Details) $ in Millions	6 Months Ended
Jun. 30, 2026 USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 1
Ending balance	126
Workforce Reductions [Member]
Restructuring Cost And Reserve [Line Items]
Changes related to 2026 merger-related employee costs	126
Prior years' restructurings [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve activity	(1)
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesCurrent
Restructuring Cost And Reserve [Line Items]
Beginning balance	1
Ending balance	78
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesCurrent \| Workforce Reductions [Member]
Restructuring Cost And Reserve [Line Items]
Changes related to 2026 merger-related employee costs	78
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesCurrent \| Prior years' restructurings [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve activity	(1)
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Restructuring Cost And Reserve [Line Items]
Beginning balance	0
Ending balance	48
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Workforce Reductions [Member]
Restructuring Cost And Reserve [Line Items]
Changes related to 2026 merger-related employee costs	48
Location, Statement of Financial Position, Activity, Accrual [Axis]: us-gaap:OtherLiabilitiesNoncurrent \| Prior years' restructurings [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve activity	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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- Definition

Amount of expense (reversal of expense) which increases (decreases) the restructuring reserve from an adjustment to a previously accrued restructuring liability.

+ References

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Amount of increase (decrease) in the accrual for restructuring costs.

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