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Employee Benefit Plans, Fair Value of Assets Qualified Plans (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | $ 2,428 | $ 2,097
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 1,078 | 1,115
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 1,350 | 982
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
US Companies [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 571 | 562
US Companies [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [1] | 571 | 562
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
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 |  | 188 | 164
International Companies [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 187 | 164
International Companies [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 1 | 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 |  | 4 | 3
Preferred Stock [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 4 | 3
Preferred Stock [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
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 |  | 118 | 90
International Growth [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 118 | 90
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] | 85 | 230
Index Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [2] | 85 | 230
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
Index Fund - Equity Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 70.00% | 50.00%
Index Fund - Debt Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 30.00% | 50.00%
Corporate Debt Instruments [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | $ 272 | $ 280
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 |  | 272 | 280
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 |  | 45 | 52
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 45 | 52
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 |  | 144 | 158
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 |  | 144 | 158
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 | [3] | 621 | 434
Common Collective Trusts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [3] | 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 | [3] | 621 | 434
Common Collective Trusts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets | [3] | $ 0 | $ 0
Common Collective Trusts - Equity Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 80.00% | 90.00%
Common Collective Trusts - Debt Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
Defined benefit plan, actual plan asset allocations |  | 20.00% | 10.00%
Pooled Separate Accounts [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | $ 192 |
Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 |
Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 192 |
Pooled Separate Accounts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 |
Private Funds [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 101 | $ 76
Private Funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Private Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 101 | 76
Private Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Insurance Contract [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 18 | 18
Insurance Contract [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Insurance Contract [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 18 | 18
Insurance Contract [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 |  | 86 | 72
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 |  | 85 | 56
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 |  | 1 | 16
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
Securities Transactions Receivable (Payable), Net [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | (22) | (47)
Securities Transactions Receivable (Payable), Net [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | (22) | (47)
Securities Transactions Receivable (Payable), Net [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Values of Qualified Pension Plan Assets |  |  |
Fair value of qualified pension plan assets |  | 0 | 0
Securities Transactions Receivable (Payable), Net [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) |  |  |
Percentage of equity securities in target allocations for plan assets |  | 70.00% |
Debt Securities [Member] |  |  |
Employee Benefit Plans (Textual) |  |  |
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 70 percent equities and 30 percent bonds
[3] | This class includes primarily investments in approximately 80 percent equities and 20 percent bonds as of December 31, 2017. As of December 31, 2016, the class included primarily investments in approximately 90 percent equities and 10 percent bonds.

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one 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 (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&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=82843861&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=82843861&loc=d3e1928-114920 + Details
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