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Fair Value Measurements Narrative (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of equity investment in Ferrous Resources prior to acquisition of controlling interest | $ 0 | $ (36) |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Impairment of PP&E | 82 | 10 |
Gaming Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Impairment of intangible assets | 14 |  |
Gaming Segment [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Transfer out of Level 3 | 126 |  |
Gaming Segment [Member] | Held-to-maturity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Fair value of investments measured at fair value on a non-recurring basis | 21 |  | $ 9
Holding Company [Member] | Trading Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Purchases of level 3 investment | 50 | $ 100 |
Fair value of investments measured at fair value on a recurring basis | 207 |  | $ 157
Energy Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Impairment of goodwill | $ 574 |  |

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- Definition Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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