Debt Kinder Morgan G.P., Inc. Preferred Shares (Details) (USD $)	6 Months Ended
Jun. 30, 2012
Debt Disclosure [Abstract]
Cash distribution of preferred stock (usd per share)	$ 20.825

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

No definition available.

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