Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Net income/(loss)	$ 295	$ 451
Other comprehensive income/loss), net of tax (Note 10)
Foreign currency translation	208	333
Total other comprehensive income/(loss), net of tax	208	333
Comprehensive income/(loss)	$ 503	$ 784