Fair Value Option - Fair Value Option on Liabilities (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Long-term debt		$ 4,598	$ 6,762
Due to affiliates		500	512
Total fixed rate debt accounted for under FVO		5,098	7,274
Unpaid principal balance of fixed rate debt accounted for under FVO	[1]	4,858	6,888
Fixed rate long-term debt not accounted for under FVO		5,050	5,863
Change in debt balance from foreign currency translation adjustment		$ (353)	$ (146)

[1] Balance includes a foreign currency translation adjustment relating to our foreign denominated FVO debt which decreased the debt balance by $353 million at June 30, 2015 and decreased the debt balance by $146 million at December 31, 2014.