Goodwill, Intangible Assets and Impairment - Schedule of Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Goodwill Gross, beginning of period		$ 389	$ 0
Accumulated Impairment Losses, beginning of period		(74)	0
Goodwill Net , beginning of period		315	0
Additions		0	389
Impairments	(74)	0	(74)
Goodwill Gross, end of period	389	389	389
Accumulated Impairment Losses, end of period	(74)	(74)	(74)
Goodwill Net, end of period	$ 315	$ 315	$ 315