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Debt - Debt With Interest Rates And Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Finance leases	$ 25	$ 8
Discounts, premiums, and debt issuance costs	(1,012)	(809)
Total debt	12,681	12,196
Less current maturities	(579)	(316)
Long-term debt	12,102	11,880
3.65% maturing to 2025
Debt Instrument [Line Items]
Notes and debentures	$ 2,673	3,048
Long-term debt, weighted average interest rate	3.65%
4.32% maturing 2026 to 2031
Debt Instrument [Line Items]
Notes and debentures	$ 2,714	2,714
Long-term debt, weighted average interest rate	4.32%
4.11% maturing 2037 to 2055
Debt Instrument [Line Items]
Notes and debentures	$ 7,497	5,904
Long-term debt, weighted average interest rate	4.11%
4.11% maturing 2037 to 2055
Debt Instrument [Line Items]
Notes and debentures	$ 784	$ 1,331
Long-term debt, weighted average interest rate	6.07%

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-SubTopic 20
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- Definition

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

+ References

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-Publisher FASB
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-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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Amount of long-term debt and lease obligation, classified as noncurrent.

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Amount of long-term debt and lease obligation, classified as current.

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Weighted average interest rate of long-term debt outstanding calculated at point in time.

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