Taxes on Earnings from Continuing Operations - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits
Balance at the beginning of the period	$ 1,175	$ 1,120
Increase due to current year tax positions	190	137
Increase due to prior year tax positions	97	75
Decrease due to prior year tax positions	(144)	(117)
Settlements	(27)	(32)
Lapse of statute	(81)	(8)
Balance at the end of the period	1,210	$ 1,175
Unrecognized tax benefits that would impact effective tax rate	1,080
Minimum
Reconciliation of Unrecognized Tax Benefits
Decrease reasonably possible in gross unrecognized tax benefits	70
Maximum
Reconciliation of Unrecognized Tax Benefits
Decrease reasonably possible in gross unrecognized tax benefits	$ 430

Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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