Debt (Fair Value) (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Senior Notes
Debt Instrument [Line Items]
Fair value of long-term debt	$ 19,490	$ 22,010

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