Increase/decrease in diluted earnings per share due to change in accounting estimate.

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[Line Items] for Change in Estimate

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Changes in estimated revenues, cost of sales and the related effect on operating income are recognized using a cumulative catch-up adjustment which recognizes in the current period the cumulative effect of the changes on current and prior periods based on a contract’s percent complete

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Changes in estimated revenues recognized using a cumulative catch-up adjustment which recognizes in the current period the cumulative effect of the changes on current and prior periods based on a contract’s percent complete

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Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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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 unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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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 cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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Basis Of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Oct. 26, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Basis of Presentation [Line Items]
Net Cash Provided by (Used in) Operating Activities				$ (14,401)	$ (226)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (11,553)		$ (3,809)	(11,553)	(3,809)		$ (11,382)		$ (8,300)	$ (4,943)	$ 410
Net Cash Provided by (Used in) Operating Activities				14,401	226
Increase/(Decrease) in revenue due to change in accounting estimate	25		(63)	(265)	166
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate	$ (38)		$ (23)	$ (787)	$ 152
Change in Earnings Per Share Due to Change in Accounting Estimate	$ (0.03)		$ (0.04)	$ (0.83)	$ 1.20
Commercial Paper	$ 1,900			$ 1,900					6,100
Cash, Cash Equivalents, and Short-term Investments	27,100			27,100
Debt and Lease Obligation	61,000			61,000
Debt Instrument, Unused Borrowing Capacity, Amount	3,200			3,200
Debt Instrument, Face Amount							25,000
Senior Notes [Member] \| 2021 [Member]
Basis of Presentation [Line Items]
Long-term Debt, Current Maturities	1,450			1,450
Supply Chain Financing [Member]
Basis of Presentation [Line Items]
Accounts Payable, Trade	4,800			4,800
Three Hundred And Sixty Four Day Revolving Credit Facility \| Subsequent Event [Member]
Basis of Presentation [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount						$ 3,100
Revolving Credit Facility
Basis of Presentation [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	9,600			9,600					9,600
Delayed Draw Term Loan Facility
Basis of Presentation [Line Items]
Proceeds from Long-term Lines of Credit		$ 13,825
Q4 2020 \| Senior Notes [Member]
Basis of Presentation [Line Items]
Long-term Debt, Current Maturities	350			350
Q4 2020 \| Three Hundred And Sixty Four Day Revolving Credit Facility
Basis of Presentation [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	3,200			3,200
Retained Earnings
Basis of Presentation [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 47,029		$ 53,986	$ 47,029	$ 53,986		$ 47,478		$ 50,644	$ 52,819	$ 55,941
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2016-13
Basis of Presentation [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ (162)
Cumulative Effect, Period of Adoption, Adjustment \| Retained Earnings \| Accounting Standards Update 2016-13
Basis of Presentation [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest								$ (162)