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Employee Benefit Plans - Summary of Change in Assets Measured at Level 3 (Details) - Level 3 - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | $ 143 | $ 134
Actual Return on Plan Assets: |  |
Assets held at the reporting date | 15 | 2
Assets sold during the period | (4) | 0
Purchases, Sales and Settlements | (24) | 10
Transfers in and/or out of Level 3 | (1) | (3)
Fair value of plan assets at December 31 | 129 | 143
International |  |
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | 0 | 0
Actual Return on Plan Assets: |  |
Assets held at the reporting date | 4 | 0
Assets sold during the period | (4) | 0
Purchases, Sales and Settlements | 0 | 0
Transfers in and/or out of Level 3 | 1 | 0
Fair value of plan assets at December 31 | 1 | 0
Corporate |  |
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | 30 | 19
Actual Return on Plan Assets: |  |
Assets held at the reporting date | (2) | 1
Assets sold during the period | 0 | 0
Purchases, Sales and Settlements | (7) | 10
Transfers in and/or out of Level 3 | 0 | 0
Fair value of plan assets at December 31 | 21 | 30
Bank Loans |  |
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | 11 | 11
Actual Return on Plan Assets: |  |
Assets held at the reporting date | 0 | 0
Assets sold during the period | 0 | 0
Purchases, Sales and Settlements | (4) | 3
Transfers in and/or out of Level 3 | (2) | (3)
Fair value of plan assets at December 31 | 5 | 11
Real Estate |  |
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | 56 | 60
Actual Return on Plan Assets: |  |
Assets held at the reporting date | 13 | 1
Assets sold during the period | 0 | 0
Purchases, Sales and Settlements | (13) | (5)
Transfers in and/or out of Level 3 | 0 | 0
Fair value of plan assets at December 31 | 56 | 56
Other |  |
The effect of fair-value measurements using significant unobservable inputs on changes in Level 3 plan assets for the period are outlined below |  |
Fair value of plan assets at January 1 | 46 | 44
Actual Return on Plan Assets: |  |
Assets held at the reporting date | 0 | 0
Assets sold during the period | 0 | 0
Purchases, Sales and Settlements | 0 | 2
Transfers in and/or out of Level 3 | 0 | 0
Fair value of plan assets at December 31 | $ 46 | $ 46

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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=108410482&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=112275985&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=108410482&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=112275985&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=108410482&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=108410482&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=108410482&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=112275985&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 (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: 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=108410482&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment. + 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)(B) -URI http://asc.fasb.org/extlink&oid=108410482&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=112275985&loc=d3e4179-114921 + Details
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