Amount of increase (decrease) in accumulated benefit obligation from change in existing term of defined benefit plan or initiation of new defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (r)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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- Definition

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.

+ References

No definition available.

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- Definition

Cost Before Equalization

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- Definition

Aggregate Estimated Cost, Percent of Defined Benefit Plan Obligation

+ References

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- Definition

Cost of Equalization

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- Definition

Defined Benefit Plan, Estimated Annual Amortization to Prior Service Cost

+ References

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Employee Benefit Plans - Plan Amendments (Details) £ in Millions, $ in Millions	1 Months Ended		12 Months Ended
	Dec. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 GBP (£)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 GBP (£)	Nov. 30, 2020 USD ($)	Nov. 30, 2020 GBP (£)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 GBP (£)
United States of America, Dollars
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of accounted for as an actuarial gain \| £				£ 18
United Kingdom, Pounds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of accounted for as an actuarial gain \| £				£ 13
Pension Plan \| United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of accounted for as an actuarial gain			$ 86		$ (240)
Pension Plan \| United States \| United States of America, Dollars
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost of equalization							$ 4		$ 42
Cost before equalization	$ 31		31
Pension Plan \| United States \| United Kingdom, Pounds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost before equalization \| £						£ 23
Pension Plan \| Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of accounted for as an actuarial gain			$ 233		(439)
Pension Plan \| U.K.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost of equalization, percent of defined benefit plan obligation (percent)	0.80%		0.80%			0.80%			1.20%	1.20%
Pension Plan \| U.K. \| United States of America, Dollars
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual amortization to prior service cost							$ 2
Pension Plan \| U.K. \| United Kingdom, Pounds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost of equalization \| £								£ 3		£ 33
Retiree Health
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Reduction of accounted for as an actuarial gain			$ 1		$ (4)
Retiree Health \| United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation, increase (decrease) for plan amendment	$ 50	$ 11