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Taxes on Earnings from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended			15 Months Ended
	Dec. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2018
Taxes on Earnings from Continuing Operations
Tax benefits associated with impairment of certain assets		$ (170)
Net tax (benefits) expense primarily as a result of the resolution of various tax positions related to prior years		(140)	$ 68	$ 98
Excess tax benefits associated with share-based compensation		(100)
Increase (reduction) of provisional transition tax	$ 2,890	26	(86)	120	$ 3,010
Net tax expense for the impact of Tax cuts and jobs act		26		130
Cumulative net tax expense for the impact of Tax cuts and jobs act		1,530
Transition tax obligation		$ 805
Transition tax obligation payment period		6 years
Net benefit on remeasurement of deferred tax assets and liabilities			$ 86
Net expense (benefit) on remeasurement of deferred tax assets and liabilities				$ 10

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- Definition

Amount of tax benefits related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of tax benefits associated with impairment of certain assets.

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Amount of income tax expense (benefit)for remeasurement of deferred tax asset and liabilities from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Amount of income tax expense liability for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Period of payment of amount of income tax expense liability for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cumulative amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017.

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Amount of income tax expense (benefit) from transition tax to Tax Cuts and Jobs Act of 2017.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Amount of income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act.

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