v3.3.1.900

Retirement Benefits Plans - Other Postretirement Benefits Plan Assumptions (Details 8) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Effect on total service and interest cost, 1% increase | $ 1 |  |
Effect on total service and interest cost, 1% decrease | (1) |  |
Effect on other postretirement liabilities, 1% increase | 17 |  |
Effect on other postretirement liabilities, 1% decrease | $ (16) |  |
Other postretirement benefits plans [Member] |  |  |
Assumptions used to determine benefit obligation at year-end |  |  |
Discount rate | 4.04% | 3.79% | 4.48%
Health care cost trend rate assumed for next year | 7.10% | 6.31% | 6.64%
Ultimate health care cost trend rate | 4.75% | 4.77% | 4.77%
Year ultimate health care cost trend rate is achieved | 2025 | 2024 | 2023
Assumptions used to determine expense |  |  |
Discount rate | 3.79% | 4.48% | 3.79%
Initial health care cost trend rate | 6.31% | 6.64% | 6.96%
Ultimate health care cost trend rate | 4.77% | 4.77% | 4.53%
Year ultimate health care cost trend rate is achieved | 2024 | 2023 | 2022

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- Definition Assumptions used to determine expense initial health care cost trend rate. + References No definition available. + Details
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- Definition Defined Benefit Plan, Assumptions Used to Determine Benefit Obligation, Health Care Cost Trend Rate Assumed For Next Year + References No definition available. + Details
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- Definition Defined Benefit Plan Ultimate Health Care Cost Trend Rate Assumptions Used To Determine Benefit Obligation + References No definition available. + Details
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- Definition Defined Benefit Plan Year That Rate Reaches Ultimate Trend Rate Assumptions Used To Determine Expense. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The ultimate trend rate for health care costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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