Derivative Financial Instruments (Details 8) (Derivatives and non-derivative hedging instruments in net investment hedging relationships [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	$ (57)	$ 37	$ (107)	$ 27
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)		0	(71)	0
Non-derivative hedging instruments [Member]
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	0	0	6	0
Non-derivative hedging instruments [Member] | Net Investment Gains (Losses) [Member]
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	0	0	0	0
Foreign currency forwards [Member]
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	(57)	37	(113)	27
Foreign currency forwards [Member] | Net Investment Gains (Losses) [Member]
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	0	0	0	0
Net Investment Gains (Losses) [Member]
Derivatives and Non-Derivative Hedging Instruments in Net Investment Hedging Relationships
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	$ 0	$ 0	$ 0	$ 0