Share-Based Incentive Compensation (details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 years count	Sep. 30, 2010	Dec. 31, 2010 years
Share-Based Incentive Compensation disclosure
Stock options vested at end of period, number (in shares)	12,994,952		12,994,952
Stock options vested at end of period, weighted average exercise price (per share)	$ 46.54		$ 46.54
Stock options vested at end of period, weighted average contractual life remaining (in years)			4.5
Stock options vested at end of period, aggregate intrinsic value	$ 55,000,000		$ 55,000,000
Stock options exercisable at end of period, number (in shares)	9,234,485		9,234,485
Stock options exercisable at end of period, weighted average exercise price (per share)	$ 44.83		$ 44.83
Stock options exercisable at end of period, weighted average contractual life remaining (in years)			3.5
Stock options exercisable at end of period, aggregate intrinsic value	45,000,000		45,000,000
Total compensation cost recognized in earnings for all share-based incentive compensation awards	27,000,000	27,000,000	94,000,000	98,000,000
Tax benefits recognized in the consolidated statement of income related to compensation costs	9,000,000	0	32,000,000	25,000,000
Total unrecognized compensation cost related to all nonvested share-based incentive compensation awards	$ 140,000,000		$ 140,000,000		$ 112,000,000
Weighted-average period of recognition for unrecognized compensation cost (in years)			1.8		1.7