Debt (Long-Term Debt) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt
Future finance lease payments, net	$ 1,608	$ 1,201
Total debt	14,608	15,201
Unamortized discount and debt issuance costs	(163)	(169)
Less: Current portion of Notes	0	(999)
Less: Current portion of future finance lease payments, net	(117)	(101)
Long-term debt	14,328	13,932
2011-2020 Notes Issuances
Debt
Notes issuances	$ 13,000	$ 14,000
2011-2020 Notes Issuances \| Minimum
Debt
Coupon Rate	0.45%
Effective Interest Rate	0.57%
2011-2020 Notes Issuances \| Maximum
Debt
Coupon Rate	3.38%
Effective Interest Rate	3.38%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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- Definition

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

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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- Definition

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

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

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

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