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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | $ 883 | $ 984
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 51 | 81
Purchases of long-term investments | (19) | (13)
Net sales of short-term investments - non-fiduciary | 301 | (13)
Acquisition of businesses, net of cash acquired | (464) | (26)
Proceeds from sale of businesses | 48 | 6
Capital expenditures | (179) | (174)
CASH USED FOR INVESTING ACTIVITIES | (262) | (139)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | (1,750) | (1,025)
Advances (to) from affiliates | 0 | 0
Issuance of shares for employee benefit plans | 58 | 84
Issuance of debt | 4,255 | 4,270
Repayment of debt | (3,073) | (3,870)
Cash dividends to shareholders | (201) | (159)
Purchase of shares from noncontrolling interests | 1 | (6)
Dividends paid to noncontrolling interests | (18) | (13)
Proceeds from sale-leaseback | 25 | 0
CASH USED FOR FINANCING ACTIVITIES | (703) | (719)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (13) | (48)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (95) | 78
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 477 | 291
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 382 | 369
Aon plc [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 309 | (14)
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 0 | 0
Purchases of long-term investments | 0 | 0
Net sales of short-term investments - non-fiduciary | 0 | 0
Acquisition of businesses, net of cash acquired | 0 | 0
Proceeds from sale of businesses | 0 | 0
Capital expenditures | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | 0 | 0
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | (1,750) | (1,025)
Advances (to) from affiliates | (253) | 405
Issuance of shares for employee benefit plans | 58 | 84
Issuance of debt | 2,714 | 1,145
Repayment of debt | (877) | (449)
Cash dividends to shareholders | (201) | (159)
Purchase of shares from noncontrolling interests | 0 | 0
Dividends paid to noncontrolling interests | 0 | 0
Proceeds from sale-leaseback | 0 |
CASH USED FOR FINANCING ACTIVITIES | (309) | 1
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 0 | (13)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 0 | 131
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 0 | 118
Aon Corporation [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | (348) | (195)
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 39 | 8
Purchases of long-term investments | (19) | (13)
Net sales of short-term investments - non-fiduciary | 103 | (35)
Acquisition of businesses, net of cash acquired | 0 | 0
Proceeds from sale of businesses | 0 | 0
Capital expenditures | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | 123 | (40)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 | 0
Advances (to) from affiliates | 496 | 610
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 1,541 | 2,894
Repayment of debt | (1,491) | (3,177)
Cash dividends to shareholders | 0 | 0
Purchase of shares from noncontrolling interests | 0 | 0
Dividends paid to noncontrolling interests | 0 | 0
Proceeds from sale-leaseback | 0 |
CASH USED FOR FINANCING ACTIVITIES | 546 | 327
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 321 | 92
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 247 | 199
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 568 | 291
Other Non-Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 922 | 1,193
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 12 | 73
Purchases of long-term investments | 0 | 0
Net sales of short-term investments - non-fiduciary | 198 | 22
Acquisition of businesses, net of cash acquired | (464) | (26)
Proceeds from sale of businesses | 48 | 6
Capital expenditures | (179) | (174)
CASH USED FOR INVESTING ACTIVITIES | (385) | (99)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 | 0
Advances (to) from affiliates | 371 | (1,014)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 0 | 231
Repayment of debt | (705) | (244)
Cash dividends to shareholders | 0 | 0
Purchase of shares from noncontrolling interests | 1 | (6)
Dividends paid to noncontrolling interests | (18) | (13)
Proceeds from sale-leaseback | 25 |
CASH USED FOR FINANCING ACTIVITIES | (326) | (1,046)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (13) | (48)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 198 | 0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 1,246 | 0
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 1,444 | 0
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 0 | 0
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from sale of long-term investments | 0 | 0
Purchases of long-term investments | 0 | 0
Net sales of short-term investments - non-fiduciary | 0 | 0
Acquisition of businesses, net of cash acquired | 0 | 0
Proceeds from sale of businesses | 0 | 0
Capital expenditures | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | 0 | 0
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 | 0
Advances (to) from affiliates | (614) | (1)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 0 | 0
Repayment of debt | 0 | 0
Cash dividends to shareholders | 0 | 0
Purchase of shares from noncontrolling interests | 0 | 0
Dividends paid to noncontrolling interests | 0 | 0
Proceeds from sale-leaseback | 0 |
CASH USED FOR FINANCING ACTIVITIES | (614) | (1)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (614) | (1)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | (1,016) | (39)
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ (1,630) | $ (40)

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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