Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 673	$ 689	$ (977)	$ 2,006
Other comprehensive income (loss), net of reclassification adjustments:
Foreign currency translation gain (loss)	(214)	353	(123)	88
Unrealized gains (losses) on investments, net	67	243	(14)	459
Tax (expense) benefit on unrealized gains (losses) on investments, net	(33)	(86)	(1)	(175)
Unrealized gains (losses) on hedging activities, net	174	(135)	211	(24)
Tax (expense) benefit on unrealized gains (losses) on hedging activities, net	(2)	4	(6)	1
Other comprehensive income (loss), net tax	(8)	379	67	349
Comprehensive income (loss)	$ 665	$ 1,068	$ (910)	$ 2,355