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Employee Benefit Plans, Fair Value of Assets Qualified Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | $ 1,947 | $ 1,978
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 1,065 | 1,155
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 882 | 823
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Other US Companies [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 503 | 541
Other US Companies [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 503 | 541
Other US Companies [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 0 | 0
Other US Companies [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 0 | 0
International Companies [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 158 | 144
International Companies [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 158 | 144
International Companies [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
International Companies [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Preferred Stock [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 2 | 2
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 2 | 1
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 1
Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
International Growth [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 89 | 119
International Growth [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 89 | 119
International Growth [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
International Growth [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Index Funds [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [2] | 202 | 199
Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [2] | 202 | 199
Index Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [2] | 0 | 0
Index Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [2] | 0 | 0
Corporate Debt Instruments [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 279 | 263
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 279 | 263
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
US Treasury Securities [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 57 | 71
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 57 | 71
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Other Government Securities [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 101 | 100
Other Government Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Other Government Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 101 | 100
Other Government Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Common Collective Trusts [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 403 | 379
Common Collective Trusts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Common Collective Trusts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 403 | 379
Common Collective Trusts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Private Fund [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 37 | 40
Private Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Private Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 37 | 40
Private Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Insurance Contracts [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 19 | 18
Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 19 | 18
Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Interest and Dividends Receivable [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 5 | 5
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 5 | 5
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Interest and Dividends Receivable [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Cash and Cash Equivalents [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 92 | 97
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 49 | 75
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 43 | 22
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | $ 0 | $ 0
Equity Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 60.00% |
Percentage of equity securities in target allocations for plan assets |  | 70.00% |
Debt Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 40.00% |
Percentage of equity securities in target allocations for plan assets |  | 30.00% |
[1] | Equity securities are held in a wide range of industrial sectors, including consumer goods, information technology, healthcare, industrials, and financial services.
[2] | This class includes primarily investments in approximately 60 percent equities and 40 percent bonds.

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -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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