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Share-Based Compensation, T-Bucks EPP and Long-Term Incentive Plan (Details) $ / shares in Units, ZAR in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 USD ($) $ / shares shares | Dec. 31, 2012 ZAR shares | Mar. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
T-Bucks Employee Participation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Amount funded to the trust | $ 15 | ZAR 124 |  |
T-Bucks Employee Participation Plan [Member] | Class A [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares acquired by the Trust (in shares) | 548,234 | 548,234 |  |
Per share fair value on the date of purchase (in dollars per share) | $ / shares | $ 25.79 |  |  |
Shares outstanding (in shares) |  |  | 548,234 | 548,234
Long-term Incentive Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Long term incentive plan liability | $ |  |  | $ 1 | $ 1

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- Definition Number of shares that have been acquired by the trust during the period. + References No definition available. + Details
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- Definition Refers to the amount transferred to fund for acquisition of shares during the period. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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