Borrowings (Interest on Debt) (Details 5) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Interest on Debt
Cost of financing	$ 407	$ 407
Interest expense	346	366
Net investment derivative activity	(6)	1
Interest capitalized	(1)	3
Total interest paid and accrued	$ 746	$ 777