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Supplemental Financial Information - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Liabilities, Noncurrent [Abstract]
Extended Emergency Time Off	$ 0	$ 57
Voluntary Separation Program 2020	297	321
Postretirement obligation	430	428
Other deferred compensation	319	353
Other	77	88
Other noncurrent liabilities	$ 1,123	$ 1,247

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- Definition

Extended Emergency Time Off Other Noncurrent Liability

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- Definition

Voluntary Separation Program 2020 Other Noncurrent Liability

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Amount of the liabilities, classified as other, for deferred compensation arrangements payable after one year or the operating cycle, if longer.

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Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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Amount of liability, recognized in statement of financial position, for defined benefit pension and other postretirement plans, classified as noncurrent.

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