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Financial Instruments (Debt) (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Fair Value, Inputs, Level 2 [Member] |  |
Fair value of debt | $ 10,800 | $ 8,890

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13476-108611 + Details
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Balance Type: | credit
Period Type: | instant

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- Details
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Balance Type: |
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