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Investments (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Investments [Abstract]
Impairment on equity investments	$ 165
Variable Interest Entity [Line Items]
Current assets	3,498	$ 3,909
Property, Plant and Equipment, Net	34,179	34,357
OTHER LONG-TERM LIABILITIES	$ 4,376	4,198
Mortgage note liability
Variable Interest Entity [Line Items]
Stated interest rate (percentage)	5.612%
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Current assets	$ 5	3
Property, Plant and Equipment, Net	639	490
Current liabilities	52	28
OTHER LONG-TERM LIABILITIES	600	470
Variable Interest Entity, Primary Beneficiary | Mortgage note liability
Variable Interest Entity [Line Items]
OTHER LONG-TERM LIABILITIES	$ 509	$ 400

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