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Retirement Benefits (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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