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Retirement Benefits (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
United States
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial loss, net of tax of $8 and $198, $10 and $240, respectively	$ 17	$ 24
Total in accumulated other comprehensive loss	17	24
Unrecognized actuarial loss, tax	8	10
Int’l
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial loss, net of tax of $8 and $198, $10 and $240, respectively	564	740
Total in accumulated other comprehensive loss	564	740
Unrecognized actuarial loss, tax	$ 198	$ 240

X

- Definition

Defined Benefit Plan, Benefit Obligation, Unrecognized Actuarial Gain (Loss), Tax

+ References

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- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580

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-URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580

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- Definition

Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

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