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

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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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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 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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Basis Of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Basis of Presentation [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (11,382)	$ (9,360)	$ (4,943)	$ (11,382)	$ (4,943)		$ (8,300)	$ 232	$ 410
Net Cash Provided by (Used in) Operating Activities				(9,582)	2,198
Increase/(Decrease) in revenue due to change in accounting estimate	144		69	(290)	229
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate	$ 90		$ 28	$ (749)	$ 175
Change in Earnings Per Share Due to Change in Accounting Estimate	$ 0.11		$ 0.04	$ (0.82)	$ 0.22
Commercial Paper	$ 2,400			$ 2,400			6,100
Cash, Cash Equivalents, and Short-term Investments	32,400			32,400
Debt and Lease Obligation	61,400			61,400
Debt Instrument, Face Amount	25,000			25,000
Supply Chain Financing [Member]
Basis of Presentation [Line Items]
Accounts Payable, Trade	4,400			4,400
Three Hundred And Sixty Four Day Revolving Credit Facility
Basis of Presentation [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	3,200			3,200
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
Q3 2020
Basis of Presentation [Line Items]
Commercial Paper	500			500
Q4 2020
Basis of Presentation [Line Items]
Commercial Paper	1,900			1,900
Q4 2020 \| Senior Notes [Member]
Basis of Presentation [Line Items]
Long-term Debt, Current Maturities	350			350
Retained Earnings
Basis of Presentation [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 47,478	$ 49,854	$ 52,819	$ 47,478	$ 52,819		$ 50,644	$ 58,090	$ 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)