Derivative and Hedging Activities - Interest Income and Interest Expense Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Interest Income (Expense), Net [Abstract]
Interest expense on senior notes	$ 740	$ 732	$ 653
Interest expense on credit facilities	38	70	70
Interest expense on term loans	116	173	0
(Gains) losses on interest rate derivatives	58	(7)	14
Amortization of loan discount, issuance costs and other	91	89	39
Capitalized interest	(816)	(980)	(732)
Interest expense	$ 227	$ 77	$ 44