Equity (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended
	Nov. 07, 2012	Mar. 28, 2012	Dec. 31, 2012	Nov. 30, 2011
Equity [Abstract]
Dividends per share		$ 13.60
Common dividends declared ($13.60 per share)		$ 417,600,000	$ 417,606,000
Dividends payable date		Apr. 20, 2012
Dividend payable record date		Apr. 10, 2012
Equitable adjustment to stock options outstanding		19,058
Special distribution Paid date	Dec. 04, 2012
Special distribution record date	Nov. 19, 2012
Equitable adjustment to restricted stock units outstanding		6,875
Additional payout to restricted stock holders who elected cash dividend distribution	5,300,000	2,500,000
Special distribution declared per share	$ 29.00		$ 29.00
Settlement period of additional payout to restricted stock holders	Jun. 30, 2013	Jun. 30, 2013
Aggregate special distribution	$ 892,100,000
Voting common stock repurchased, authorized shares				800,000