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CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Dividends paid as cash dividend (in dollars per share)	$ 2.75	$ 0.24	$ 0.53	$ 0.54	$ 0.70	$ 0.61	$ 0.55	$ 0.57	$ 4.06		$ 2.43	$ 1.66
CAPITAL STOCK:
Dividends paid as cash dividend (in dollars per share)	$ 2.75	$ 0.24	$ 0.53	$ 0.54	$ 0.69	$ 0.61	$ 0.55	$ 0.57	$ 3.71	[1]	$ 2.43	$ 1.66
TREASURY STOCK: | Common Class A
Dividends paid as cash dividend (in dollars per share)									$ 0.35
[1] Number of shares and per share amounts have been retroactively adjusted in the financial statements to reflect the effect of the 9.0 million shares paid as stock dividend on February 28, 2012.

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareCashPaid
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration