Fair Value - Carrying Value and Fair Value Classified by Level (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Carrying Value
Assets:
Mortgage loans	$ 1,495	$ 1,524
Equity securities	625	555
Liabilities:
Long-term debt	63,111	64,570
Estimated Fair Value
Assets:
Mortgage loans	1,489	1,524
Liabilities:
Long-term debt	59,707	62,321
Level 1 \| Estimated Fair Value
Assets:
Mortgage loans	0	0
Liabilities:
Long-term debt	59,707	62,321
Level 2 \| Estimated Fair Value
Assets:
Mortgage loans	0	0
Liabilities:
Long-term debt	0	0
Level 3 \| Estimated Fair Value
Assets:
Mortgage loans	1,489	1,524
Liabilities:
Long-term debt	$ 0	$ 0

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

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Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant