Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement [Abstract]
Revenue	$ 12,261	$ 11,924	$ 11,526
Expense:
Compensation and benefits	7,226	7,134	6,969
Other operating expenses	2,958	2,961	2,919
Operating expenses	10,184	10,095	9,888
Operating income	2,077	1,829	1,638
Interest income	18	24	28
Interest expense	(167)	(181)	(199)
Cost of extinguishment of debt	(24)	0	(72)
Investment income	69	24	9
Income before income taxes	1,973	1,696	1,404
Income tax expense	594	492	422
Income from continuing operations	1,379	1,204	982
Discontinued operations, net of tax	6	(3)	33
Net income before non-controlling interests	1,385	1,201	1,015
Less: Net income attributable to non-controlling interests	28	25	22
Net income attributable to the Company	$ 1,357	$ 1,176	$ 993
Basic net income per share
Continuing operations (in dollars per share)	$ 2.46	$ 2.16	$ 1.76
Net income attributable to the Company (in dollars per share)	$ 2.47	$ 2.16	$ 1.82
Diluted net income per share
Continuing operations (in dollars per share)	$ 2.42	$ 2.13	$ 1.73
Net income attributable to the Company (in dollars per share)	$ 2.43	$ 2.13	$ 1.79
Average number of shares outstanding
Basic (in shares)	549	544	542
Diluted (in shares)	558	552	551
Shares outstanding at December 31 (in shares)	547	545	539