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Debt - Classification and Utilization (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Oct. 30, 2020
Debt
Debt maturing or subject to remarketing within twelve months	$ 3,000
Current portion of long-term debt	244		$ 551
Commercial paper borrowings (repayments)	(280)
Debt repayments	49	$ 25
Tax Exempt Bonds [Member]
Debt
Current portion of long-term debt	103
Debt with interest rate periods that expire in the next 12 months	1,200
Debt maturing or subject to remarketing within twelve months classified as long-term	2,700
Variable-rate tax-exempt bonds	54
Variable-rate tax-exempt bonds, non-current	54
Debt repayments	$ 24
Tax Exempt Bonds [Member] | Minimum [Member]
Debt
Interest rate (as a percent)	0.10%		0.10%
Tax Exempt Bonds [Member] | Maximum [Member]
Debt
Interest rate (as a percent)	4.30%		4.30%
Financing leases and other [Member]
Debt
Current portion of long-term debt	$ 213
Debt repayments	25
364-day revolving credit facility [Member]
Debt
Maximum capacity				$ 3,000
$3.5 billion revolving credit facility [Member]
Debt
Maximum capacity	3,500
Outstanding borrowings under credit facility	0
Letters of credit outstanding	269
Unused and available credit capacity	1,700
Commercial Paper Program [Member]
Debt
Current portion of long-term debt	$ 1,500
Debt term	397 days
Commercial paper borrowings	$ 1,500
Commercial paper borrowings (repayments)	(280)
Other Letter Of Credit Lines [Member]
Debt
Letters of credit outstanding	$ 609

X

- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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No definition available.

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The net cash inflow or cash outflow from issuing (borrowing) and repaying commercial paper.

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Amount of cash outflow for debt, mandatory redeemable security, and principal payment for finance lease obligation.

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Amount of short-term borrowings, long-term debt and financing leases due or subject to remarketing within the next twelve months, including amounts classified as current and amounts classified as noncurrent due to intent and ability to refinance.

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Amount of short-term borrowings, long-term debt and financing leases due or subject to remarketing within the next twelve months, including amounts classified as current and amounts classified as noncurrent due to intent and ability to refinance.

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Represent debt with interest rate periods that expire within the next 12 months.

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The long-term portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

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