Fair Value Measurements, Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Financial liabilities:
Debt (excluding finance lease obligations), at carrying amount	$ 9,150	$ 9,241
Fair Value, Inputs, Level 2 [Member]
Financial liabilities:
Debt (excluding finance lease obligations), at fair value	$ 8,549	$ 8,902

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant