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Benefit Plans - Obligations and funded status narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Components of net periodic cost |  |
Maximum annual medical cost inflation after retirement for Company's share of retiree medical benefits cost for non Medicare-eligible retirees (as a percent) | 5.00% |
Pension benefits |  |
Components of net periodic cost |  |
Amortization of prior service cost (credit), next fiscal year | $ (56) |
Percentage of underfunded status relating to the primary employee plans | 78.00% |
Accumulated benefit obligation (ABO) | $ 6,150 | $ 6,740
Company's Pension Plans with an ABO in excess of plan assets |  |
Company's pension plans with ABO in excess of plan assets, aggregate projected benefit obligation | 5,990 | 6,420
Company's pension plans with ABO in excess of plan assets, aggregate accumulated benefit obligation | 5,930 | 6,360
Company's pension plans with ABO in excess of plan assets, aggregate fair value of plan assets | 5,070 | 5,890
Defined benefit plans' accrued benefit costs related to certain unfunded and non-qualified plans | 135 | $ 140
Postretirement benefits |  |
Components of net periodic cost |  |
Amortization of prior service cost (credit), next fiscal year | $ (3) |
Defined benefit plan, assumed health care cost trend rates |  |
Weighted average health care cost trend rate | 5.90% |
Ultimate health care cost trend rate in 2038 and thereafter | 4.50% |

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- Definition This element represents the percentage limit on the annual medical cost inflation after retirement for the entity's share of the cost of retiree medical benefits for non Medicare-eligible retirees. + References No definition available. + Details
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- Definition This element represents the defined benefit plans accrued benefit costs relating to certain unfunded and Nonqualified plans. + References No definition available. + Details
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- Definition This element represents the percentage of the underfunded status that relates to the primary employee plans. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + 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 included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + 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 (l) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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- Definition Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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