Fair Value of Financial Assets and Liabilities - Fair Value of Financial Liabilities Recorded at Amortized Cost (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
SNF Obligation	$ 1,397	$ 1,366
Carrying Amount
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	7,411	8,412
SNF Obligation	1,397	1,366
Fair Value
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	7,639	8,521
SNF Obligation	1,311	1,278
Fair Value \| Level 2
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	6,934	7,805
SNF Obligation	1,311	1,278
Fair Value \| Level 3
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Long-Term Debt, including amounts due within one year	705	716
SNF Obligation	$ 0	$ 0

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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+ Details