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Debt - Debt With Interest Rates And Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Finance leases	$ 22	$ 25
Discounts, premiums, and debt issuance costs	(976)	(1,012)
Total debt	13,840	12,681
Less current maturities	(553)	(579)
Long-term debt	$ 13,287	12,102
3.40% maturing to 2026
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	3.40%
Notes and debentures	$ 2,699	3,273
4.26% maturing 2027 to 2031
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	4.26%
Notes and debentures	$ 2,614	2,114
4.02% maturing 2037 to 2055
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	4.02%
Notes and debentures	$ 8,097	7,497
5.22% maturing 2097 to 2121
Debt Instrument [Line Items]
Long-term debt, weighted average interest rate	5.22%
Notes and debentures	$ 1,384	$ 784

X

- Definition

Amount of short-term and long-term debt and lease obligation.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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