Consolidated Statements Of Income (USD $) In Millions, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Income Statement [Abstract]
Revenue	$ 2,806	$ 2,524	$ 8,618	$ 7,765
Expense:
Compensation and benefits	1,753	1,586	5,202	4,775
Other operating expenses	743	699	2,169	2,376
Operating expenses	2,496	2,285	7,371	7,151
Operating Income	310	239	1,247	614
Interest income	9	6	21	13
Interest expense	(49)	(60)	(149)	(180)
Early extinguishment of debt	(72)		(72)
Investment income		(2)	13	24
Income before income taxes	198	183	1,060	471
Income tax expense	65	55	322	98
Income from continuing operations	133	128	738	373
Discontinued operations, net of tax	2	43	17	292
Net income before non-controlling interest	135	171	755	665
Less: Net income attributable to non-controlling interests	5	3	18	13
Net income attributable to the Company	$ 130	$ 168	$ 737	$ 652
Basic net income per share
- Continuing operations	$ 0.24	$ 0.23	$ 1.32	$ 0.66
- Net income attributable to the Company	$ 0.24	$ 0.30	$ 1.35	$ 1.19
Diluted net income per share
- Continuing operations	$ 0.23	$ 0.22	$ 1.30	$ 0.65
- Net income attributable to the Company	$ 0.24	$ 0.30	$ 1.33	$ 1.18
Weighted average number of shares outstanding
- Basic	540	543	543	539
- Diluted	549	548	552	543
Shares outstanding at September 30,	538	543	538	543