Hedging Activities (Narrative) (Details) (USD $) In Millions	1 Months Ended	3 Months Ended				9 Months Ended				1 Months Ended
	Feb. 28, 2010	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010		Feb. 29, 2000 Net Investment Hedging [Member]
Debt Instrument [Line Items]
Notes issued as a hedge										$ 500
Maximum duration to hedge foreign currency risk, months						18
Repayment of balance of debt	48
Foreign currency translation adjustment	140	(377)	[1]	688	[1]	(12)	[1]	469	[1]
Net losses expected to be reclassified into earnings within the next 12 months						$ 24

[1] Other comprehensive income items for the three months ended September 30, 2011 and 2010 include net tax effects of $(6) million and $(1) million, respectively, and for the nine months ended September 30, 2011 and 2010 include net tax effects of $(36) million and $(16) million, respectively.