Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue	$ 3,088	$ 3,026	$ 6,214	$ 6,077
Expense:
Compensation and benefits	1,766	1,776	3,569	3,572
Other operating expenses	745	732	1,461	1,460
Operating expenses	2,511	2,508	5,030	5,032
Operating Income	577	518	1,184	1,045
Interest income	4	6	8	12
Interest expense	(40)	(45)	(84)	(91)
Investment income	23	4	44	24
Income before income taxes	564	483	1,152	990
Income tax expense	164	144	340	297
Income from continuing operations	400	339	812	693
Discontinued operations, net of tax	(5)	(2)	7	(2)
Net income before non-controlling interest	395	337	819	691
Less: Net income attributable to non-controlling interests	7	8	18	15
Net income attributable to the Company	$ 388	$ 329	$ 801	$ 676
Basic net income per share
- Continuing operations	$ 0.71	$ 0.61	$ 1.45	$ 1.24
- Net income attributable to the Company	$ 0.71	$ 0.60	$ 1.46	$ 1.24
Diluted net income per share
- Continuing operations	$ 0.70	$ 0.60	$ 1.42	$ 1.23
- Net income attributable to the Company	$ 0.69	$ 0.59	$ 1.44	$ 1.22
Average number of shares outstanding
- Basic (in shares)	551	545	549	544
- Diluted (in shares)	559	553	558	552
Shares outstanding at March 31, (in shares)	549	544	549	544