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Retirement Benefits (Schedule of Fair Value Measurement of Plan Assets Using Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Change in plan assets: |  |
Fair value of plan assets at beginning of period | $ 2,025 |
Fair value of plan assets at end of period | 2,089 | $ 2,025
Level 3 |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 151 |
Fair value of plan assets at end of period | 137 | 151
Int’l |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 1,961 | 1,727
Foreign exchange impact | (3) | 66
Fair value of plan assets at end of period | 2,023 | 1,961
Int’l | Equities |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 108 |
Fair value of plan assets at end of period | 88 | 108
Int’l | Fixed Income |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 1 |
Fair value of plan assets at end of period | 0 | 1
Int’l | Real Estate |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 2 |
Fair value of plan assets at end of period | 1 | 2
Int’l | Other |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 40 |
Fair value of plan assets at end of period | 48 | 40
Int’l | Level 3 |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 151 | 149
Return on assets held at end of year | (15) | 2
Return on assets sold during the year | 38 | 2
Purchases, sales and settlements | (37) | (6)
Foreign exchange impact | 0 | 4
Fair value of plan assets at end of period | 137 | 151
Int’l | Level 3 | Equities |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 108 | 103
Return on assets held at end of year | (21) | 1
Return on assets sold during the year | 36 | 0
Purchases, sales and settlements | (35) | 0
Foreign exchange impact | 0 | 4
Fair value of plan assets at end of period | 88 | 108
Int’l | Level 3 | Fixed Income |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 1 | 1
Return on assets held at end of year | 0 | 0
Return on assets sold during the year | 0 | 0
Purchases, sales and settlements | (1) | 0
Foreign exchange impact | 0 | 0
Fair value of plan assets at end of period | 0 | 1
Int’l | Level 3 | Real Estate |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 2 | 2
Return on assets held at end of year | (1) | 0
Return on assets sold during the year | 0 | 0
Purchases, sales and settlements | 0 | 0
Foreign exchange impact | 0 | 0
Fair value of plan assets at end of period | 1 | 2
Int’l | Level 3 | Other |  |
Change in plan assets: |  |
Fair value of plan assets at beginning of period | 40 | 43
Return on assets held at end of year | 7 | 1
Return on assets sold during the year | 2 | 2
Purchases, sales and settlements | (1) | (6)
Foreign exchange impact | 0 | 0
Fair value of plan assets at end of period | $ 48 | $ 40

X
- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + 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 (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit 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 (b)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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