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Fair Value Measurements Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 08, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 | $ 0 | $ 0
Holding Company [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Realized and unrealized losses |  | 18 |  |
Distribution-in-kind |  |  | (110) |
Gaming Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Realized and unrealized losses |  | 3 |  |
Investment Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Realized and unrealized losses |  | (20) | (100) |
Distribution-in-kind |  | 0 | (110) |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 55 | 75 | 287
Other Segments and Holding Company [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Realized and unrealized losses |  | 21 | (97) |
Distribution-in-kind |  | 0 |  |
Purchases |  | 100 | 0 |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 228 | 154 | $ 138
Trading Securities [Member] | Holding Company [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 55 |  |
Trading Securities [Member] | Other Segments and Holding Company [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Distribution-in-kind |  |  | $ (110) |
Managed investment funds [Member] | Automotive Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Defined Benefit Plan, Target Plan Asset Allocations |  | 73.00% |  |
Equity investment [Member] | Automotive Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 61.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations |  | 50.00% |  |
Fixed Income Investments [Member] | Automotive Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 23.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations |  | 25.00% |  |
Other Investments [Member] | Automotive Segment [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocations |  | 16.00% |  |
Defined Benefit Plan, Target Plan Asset Allocations |  | 25.00% |  |
Available-for-sale Securities [Member] | Holding Company [Member] | Recurring measurement [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Purchases |  | $ 100 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 157 |  |
Ferrous Resources [Member] |  |  |  |
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 |  |  |

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