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Fair Value Measurements Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 08, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value of investment in Ferrous Resources prior to acquisition of controlling interest |  |  |  | $ 36 | $ 0 |  |
Fair Value Of Property Plant And Equipment Impaired During Period |  | $ 17 | $ 11 | 17 | 11 |  |
Impairment of Long-Lived Assets Held-for-use |  | 6 | 4 | 10 | 6 |  |
Carrying value of property plant and equipment impaired during period |  | 27 | 17 | 27 | 17 |  |
Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Net realized and unrealized losses |  |  |  | (28) | (97) |  |
Investment Segment [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, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  |  | (12) | (33) |  |
Fair Value, Measurements, Recurring [Member] | Other Segments and Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Net realized and unrealized losses |  |  |  | (28) | (97) |  |
Distribution-in-kind |  |  |  | 0 | 110 |  |
Purchases, additions and settlements, net |  |  |  | 102 | 2 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 182 | 153 | 182 | 153 | $ 154 | $ 138
Fair Value, Measurements, Recurring [Member] | Investment Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Net realized and unrealized losses |  |  |  | (12) | (100) |  |
Distribution-in-kind |  |  |  | 0 | (110) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | 63 | $ 75 | 63 | 75 | $ 75 | $ 287
Fair Value, Measurements, Recurring [Member] | Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Distribution-in-kind |  |  |  |  | $ 110 |  |
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member] | Holding Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Purchases, additions and settlements, net |  |  |  | 100 |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value |  | $ 100 |  | $ 100 |  |  |
Ferrous Resources [Member] |  |  |  |  |  |  |
Fair Value, Instruments Classified in Shareholders' Equity Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Fair value of investment in Ferrous Resources prior to acquisition of controlling interest | $ 36 |  |  |  |  |  |

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- Definition Amount of unrealized (holding) gain (loss) which is included in the statement of income (or changes in net assets) related to those assets still held at the reporting date for which fair value is measured on a recurring basis using significant unobservable inputs (Level 3). + 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 (d) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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