Long-Term Debt (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt instruments	$ 18,730	$ 23,730
Debt due within one year	(5,054)	(5,000)
Reclassified from short-term debt	9,750	9,900
Unamortized discounts and debt issuance costs	(17)	(24)
Finance lease liabilities	282
Finance lease liabilities		127
Total long-term debt	23,691	28,733
Long-term debt maturing 2020	5,054
Long-term debt maturing 2021	2,054
Long-term debt maturing 2022	4,268
Long-term debt maturing 2024	3,003
Long-term debt maturing 2023	1,000
Long-term debt maturing after 2024	3,351
Notes \| 3.191% notes due 2023
Debt Instrument [Line Items]
Long-term debt instruments	$ 2,250	2,250
Interest rate	3.191%
Notes \| 2.954% notes due 2026
Debt Instrument [Line Items]
Long-term debt instruments	$ 2,250	2,250
Interest rate	2.954%
Notes \| 2.355% notes due 2022
Debt Instrument [Line Items]
Long-term debt instruments	$ 2,000	2,000
Interest rate	2.355%
Notes \| 1.961% notes due 2020
Debt Instrument [Line Items]
Long-term debt instruments	$ 1,750	1,750
Interest rate	1.961%
Notes \| 2.100% notes due 2021
Debt Instrument [Line Items]
Long-term debt instruments	$ 1,350	1,350
Interest rate	2.10%
Notes \| 2.419% notes due 2020
Debt Instrument [Line Items]
Long-term debt instruments	$ 1,250	1,250
Interest rate	2.419%
Notes \| 2.427% notes due 2020
Debt Instrument [Line Items]
Long-term debt instruments	$ 1,000	1,000
Interest rate	2.427%
Notes \| 2.895% notes due 2024
Debt Instrument [Line Items]
Long-term debt instruments	$ 1,000	1,000
Interest rate	2.895%
Notes \| 2.566% notes due 2023
Debt Instrument [Line Items]
Long-term debt instruments	$ 750	750
Interest rate	2.566%
Notes \| 3.326% notes due 2025
Debt Instrument [Line Items]
Long-term debt instruments	$ 750	750
Interest rate	3.326%
Notes \| 2.498% notes due 2022
Debt Instrument [Line Items]
Long-term debt instruments	$ 700	700
Interest rate	2.498%
Notes \| 2.411% notes due 2022
Debt Instrument [Line Items]
Long-term debt instruments	$ 700	700
Interest rate	2.411%
Notes \| 1.991% notes due 2020
Debt Instrument [Line Items]
Long-term debt instruments	$ 600	600
Interest rate	1.991%
Notes \| 4.950% notes due 2019
Debt Instrument [Line Items]
Long-term debt instruments	$ 0	$ 1,500
Interest rate		4.95%
Notes \| 1.561% notes due 2019
Debt Instrument [Line Items]
Long-term debt instruments	0	$ 1,350
Interest rate		1.561%
Notes \| 2.193% notes due 2019
Debt Instrument [Line Items]
Long-term debt instruments	0	$ 750
Interest rate		2.193%
Floating Rate Notes \| Floating rate notes due 2021 (2.599%)
Debt Instrument [Line Items]
Long-term debt instruments	$ 650	$ 650
Interest rate	2.599%
Floating Rate Notes \| Floating rate notes due 2022 (2.412%)
Debt Instrument [Line Items]
Long-term debt instruments	$ 650	650
Interest rate	2.412%
Floating Rate Notes \| Floating rate notes due 2020 (2.116%)
Debt Instrument [Line Items]
Long-term debt instruments	$ 400	400
Interest rate	2.116%
Floating Rate Notes \| Floating rate notes due 2019 (2.905%)
Debt Instrument [Line Items]
Long-term debt instruments	$ 0	850
Loans \| 3.400% loan
Debt Instrument [Line Items]
Long-term debt instruments	$ 218	218
Interest rate	3.40%
Loans \| 1.686% notes due 2019
Debt Instrument [Line Items]
Long-term debt instruments	$ 0	$ 550
Interest rate		1.686%
Debentures \| 8.625% debentures due 2032
Debt Instrument [Line Items]
Long-term debt instruments	$ 147	$ 147
Interest rate	8.625%
Debentures \| 8.625% debentures due 2031
Debt Instrument [Line Items]
Long-term debt instruments	$ 108	108
Interest rate	8.625%
Debentures \| 8.000% debentures due 2032
Debt Instrument [Line Items]
Long-term debt instruments	$ 75	75
Interest rate	8.00%
Debentures \| 9.750% debentures due 2020
Debt Instrument [Line Items]
Long-term debt instruments	$ 54	54
Interest rate	9.75%
Debentures \| 8.875% debentures due 2021
Debt Instrument [Line Items]
Long-term debt instruments	$ 40	40
Interest rate	8.875%
Medium-term Notes \| Medium-term notes, maturing from 2021 to 2038 (6.431%)
Debt Instrument [Line Items]
Long-term debt instruments	$ 38	$ 38
Interest rate	6.431%

Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Long-tern, Net

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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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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- Definition

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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

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

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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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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation.

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