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Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Carrying value	$ 13,832	$ 12,903
Level 2
Debt Instrument [Line Items]
Estimated fair value of long-term debt portfolio	$ 14,097	$ 13,611

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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