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Fair Value Measurements Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill | $ 577 | $ 571 |
Fair value of investment in Ferrous Resources prior to acquisition of a controlling interest | 0 | 36 | $ 0
Nonrecurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill | 577 | 571 | 103
Impairment of intangible assets (excluding goodwill) | 16 | 2 |
Impairment of property, plant and equipment | 99 | 201 | 27
Impairment of assets held for sale | 17 | 14 | $ 5
Gaming Segment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill | 3 |  |
Gaming Segment | Nonrecurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill | 3 |  |
Impairment of intangible assets (excluding goodwill) | 13 |  |
Mining Segment |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill | 0 | 6 |
Mining Segment | Nonrecurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of goodwill |  | 6 |
Mining Segment | Recurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of investment in Ferrous Resources prior to acquisition of a controlling interest |  | 36 |
Held-to-maturity securities | Gaming Segment | Nonrecurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of assets measured on a nonrecurring basis | 28 | 9 |
Corporate debt securities | Gaming Segment | Recurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Transfers out of Level 3 | 126 |  |
Trading securities | Holding Company | Recurring measurement |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Purchases (settlements), net | 50 | 100 |
Fair value of asset measured on a recurring basis | $ 207 | $ 157 |

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