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Pension and Other Postretirement Benefit Plans - Plan Asset Allocations (Details) - shares shares in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Pension [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation |  | 100.00% | 100.00%
Employer Stock Included in Equity Securities (Shares) |  | 0.0 | 0.0
Plan Asset Target Allocation |  | 100.00% |
Pension [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation |  | 47.00% | 48.00%
Plan Asset Target Allocation |  | 56.00% |
Pension [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation |  | 39.00% | 39.00%
Plan Asset Target Allocation |  | 35.00% |
Pension [Member] | Private Equity [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation |  | 8.00% | 8.00%
Pension [Member] | Real Estate [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation |  | 6.00% | 5.00%
Plan Asset Target Allocation |  | 9.00% |
Postretirement Health and Life [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation | [1] | 100.00% | 100.00%
Plan Asset Target Allocation | [2] | 100.00% |
Postretirement Health and Life [Member] | Equity Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation | [1] | 57.00% | 58.00%
Plan Asset Target Allocation | [2] | 60.00% |
Postretirement Health and Life [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation | [1] | 35.00% | 34.00%
Plan Asset Target Allocation | [2] | 37.00% |
Postretirement Health and Life [Member] | Private Equity [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation | [1] | 8.00% | 8.00%
Postretirement Health and Life [Member] | Real Estate [Member] |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |
Actual Plan Asset Allocation | [1] | 0.00% | 0.00%
Plan Asset Target Allocation | [2] | 3.00% |
[1] | Includes VEBAs and irrevocable grantor trusts.
[2] | Includes VEBAs and irrevocable grantor trusts.

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- Definition The number of employer shares or related party shares included in plan assets. + 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 (n) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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