Equity-Indexed Compensation Plans (Details 2) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended		98 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
Grant Date Fair Value of Outstanding AAP Management Units:
Equity-indexed compensation expense	$ 22	$ 27	$ 91
AAP Management Units
Reserved for Future Grants
Reserved for future grants, beginning balance (in units)		3.0
Granted (in units)		(1.6)
Reserved for future grants, ending balance (in units)		1.4		1.4
Outstanding
Outstanding at the beginning of the period (in units)		49.1
Granted (in units)		1.6
Outstanding at the ending of the period (in units)		50.7		50.7
Outstanding Units Earned
Outstanding Units Earned, beginning balance (in units)		47.8
Earned (in units)		0.7
Outstanding Units Earned, end balance (in units)		48.5		48.5
Grant Date Fair Value of Outstanding AAP Management Units:
Grant Date Fair Value of Outstanding AAP Management Units, beginning balance		$ 64
Granted		24
Grant Date Fair Value of Outstanding AAP Management Units, ending balance		88		$ 88
Equity-indexed compensation expense		$ 1		$ 57