Commitments and Contingencies (Details) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026 USD ($) plantiff	Jun. 30, 2026 USD ($) plantiff	Mar. 31, 2026 USD ($)
Commitments and Contingencies [Line Items]
Number of putative nationwide classes of plaintiffs \| plantiff	2	2
Extension period		3 years
Financial guarantees	$ 783	$ 783
Unfunded loan commitments	401	401
Technology Infrastructure and Related Management and Support Services
Commitments and Contingencies [Line Items]
Purchase Commitment, Remaining Minimum Amount Committed	1,412	1,412
CMS Notice of Possible Sanction \| Threatened Litigation
Commitments and Contingencies [Line Items]
Loss contingency accrual, payments	342
Loss Contingency, Estimate of Possible Loss	593	593	$ 935
CMS Notice of Possible Sanction \| Minimum \| Threatened Litigation
Commitments and Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	320	320
CMS Notice of Possible Sanction \| Maximum \| Threatened Litigation
Commitments and Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 320	$ 320

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