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Equity-Indexed Compensation Plans (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Consolidated Equity-Indexed Compensation Information
Equity-indexed compensation expense	$ 17	$ 22	$ 96	$ 82
LTIP unit-settled vestings	1	2	47	60
LTIP cash-settled vestings		1	61	66
DER cash payments	2	2	5	5
PNG \| Maximum
Other Consolidated Equity-Indexed Compensation Information
LTIP unit-settled vestings				$ 1

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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