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Fair Value Measurements and Financial Instruments - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Carrying Value
Debt Instrument [Line Items]
Carrying value of long-term debt	$ 7,961	$ 7,343
Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Estimated fair value of long-term debt	$ 8,550	$ 8,175

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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