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Pension and Other Postretirement Benefits (Schedule of Reconciliation of Plan Assets Measured by Significant Unobservable Inputs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Level 3 |  |
Plan Assets |  |
Balance at beginning of period | $ 464 | $ 533
Foreign currency translation | 10 | 16
Asset returns – assets held at reporting date | (6) | (3)
Asset returns – assets sold during the period | (18) | 30
Purchases, sales and settlements, net | (90) | (112)
Balance at end of period | 360 | 464
Level 3 | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 43 | 113
Foreign currency translation | 1 | 4
Asset returns – assets held at reporting date | 3 | (6)
Asset returns – assets sold during the period | (12) | 7
Purchases, sales and settlements, net | (33) | (75)
Balance at end of period | 2 | 43
Level 3 | Private equity |  |
Plan Assets |  |
Balance at beginning of period | 75 | 103
Foreign currency translation | 2 | 4
Asset returns – assets held at reporting date | 6 | (22)
Asset returns – assets sold during the period | (9) | 17
Purchases, sales and settlements, net | (23) | (27)
Balance at end of period | 51 | 75
Level 3 | Defined Benefit Plan, Real Estate |  |
Plan Assets |  |
Balance at beginning of period | 346 | 317
Foreign currency translation | 7 | 8
Asset returns – assets held at reporting date | (15) | 25
Asset returns – assets sold during the period | 3 | 6
Purchases, sales and settlements, net | (34) | (10)
Balance at end of period | 307 | 346
Fair Value Measured at Net Asset Value Per Share | Investment funds – global equity |  |
Plan Assets |  |
Balance at beginning of period | 96 |
Balance at end of period | 141 | 96
Fair Value Measured at Net Asset Value Per Share | Investment funds – emerging markets |  |
Plan Assets |  |
Balance at beginning of period | 23 |
Balance at end of period | 7 | 23
Fair Value Measured at Net Asset Value Per Share | Hedge funds |  |
Plan Assets |  |
Balance at beginning of period | 328 |
Balance at end of period | 109 | 328
Fair Value Measured at Net Asset Value Per Share | Investment funds – fixed income |  |
Plan Assets |  |
Balance at beginning of period | 193 |
Balance at end of period | $ 137 | $ 193

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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 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=118255775&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=118257860&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=118255775&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=118257860&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=118255775&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=118255775&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=118255775&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=118257860&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=118255775&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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