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Pension Plans and Other Postretirement Benefits - General (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) plan | Dec. 31, 2015 USD ($) plan
Pension Plans and Other Postretirement Benefits |  |  |
Employer's contributions under defined contribution plans | $ 314 | $ 295 | $ 251
Number of defined benefit plans | plan |  | 7 | 7
Settlement loss | 187 |  |
Pension Plans |  |  |
Pension Plans and Other Postretirement Benefits |  |  |
Settlement loss | 187 |  |
Tax Qualified Pension Plans, Defined Benefit |  |  |
Pension Plans and Other Postretirement Benefits |  |  |
Number of defined benefit plans | plan |  | 2 | 2
Settlement loss | $ 187 |  |
Unfunded Nonqualified Supplemental Retirement Plans |  |  |
Pension Plans and Other Postretirement Benefits |  |  |
Number of defined benefit plans | plan |  | 5 | 5

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- Definition Represents the number of defined benefit plans covering all eligible employees of the entity. + 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 net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Details
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- Details
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