Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Revenue	$ 3,126	$ 3,051
Expense:
Compensation and benefits	1,803	1,796
Other operating expenses	716	728
Operating expenses	2,519	2,524
Operating Income	607	527
Interest income	4	6
Interest expense	(44)	(46)
Investment income	21	20
Income before income taxes	588	507
Income tax expense	176	153
Income from continuing operations	412	354
Discontinued operations, net of tax	12	0
Net income before non-controlling interest	424	354
Less: Net income attributable to non-controlling interests	11	7
Net income attributable to the Company	$ 413	$ 347
Basic net income per share
- Continuing operations	$ 0.73	$ 0.64
- Net income attributable to the Company	$ 0.75	$ 0.64
Diluted net income per share
- Continuing operations	$ 0.72	$ 0.63
- Net income attributable to the Company	$ 0.74	$ 0.63
Average number of shares outstanding
- Basic (in shares)	548	542
- Diluted (in shares)	557	551
Shares outstanding at March 31, (in shares)	550	546