Basis Of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Basis of Presentation [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ (3,387)	$ (4,302)
Debt Instrument, Face Amount	9,825
Repayments of Debt	9,847	5,854
Debt, Current	6,021		$ 1,693
Cash, Cash Equivalents, and Short-term Investments	21,900		25,600
Debt and Lease Obligation	63,600
Increase/(Decrease) in revenue due to change in accounting estimate	7	(434)
Increase/(Decrease) in (Loss)/earnings from operations due to change in accounting estimate	$ (176)	$ (839)
Change in Earnings Per Share Due to Change in Accounting Estimate	$ (0.29)	$ (0.63)
Senior Notes [Member] \| 2021 [Member]
Basis of Presentation [Line Items]
Long-term Debt, Current Maturities	$ 1,500
Supply Chain Financing [Member]
Basis of Presentation [Line Items]
Accounts Payable, Trade	3,800
Revolving Credit Facility
Basis of Presentation [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	14,753
Debt Instrument, Unused Borrowing Capacity, Amount	14,800		$ 9,500
Delayed Draw Term Loan Facility
Basis of Presentation [Line Items]
Repayments of Debt	9,825
Debt, Current	$ 4,000

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[Line Items] for Change in Estimate

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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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Amount of short-term and long-term debt and lease obligation.

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