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Pension and Postretirement Benefit Plans - Pension Asset Fair Value Level 3 (Details) - Qualified and Non-qualified Pension Benefits - International - Funded - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Benefit Plan Information |  |
Foreign currency exchange | $ 346 | $ (560)
Level 3 |  |
Benefit Plan Information |  |
Foreign currency exchange | (13) | 16
Defined benefit plan increases related to net purchases and unrealized gains losses |  | $ 48
Defined benefit plan decreases related to net purchases and unrealized gains losses | $ (11) |

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- Definition This represents the decrease in plan assets related to net purchases and unrealized gains/losses. + References No definition available. + Details
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- Definition This represents the increase in plan assets related to net purchases and unrealized gains/losses. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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