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Restructuring and Transaction Costs (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs	$ 258	$ 49	$ 84
Merger Integration [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs	210
Noncash restructuring costs	21
Transaction Costs [Member]
Restructuring Cost And Reserve [Line Items]
Underwriting, bank, legal and accounting fees	48
Reduction of workforce [Member]
Restructuring Cost And Reserve [Line Items]
Noncash restructuring costs	66	11	31
Reduction of workforce [Member] | Defined Benefit Settlements [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs	$ 41	9	7
Reduction of workforce [Member] | Employee Related Costs [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring and transaction costs		$ 41	$ 84

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- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

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- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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