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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

X

- 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

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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.

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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

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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

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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

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