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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Cash provided by (used for) operating activities - continuing operations | $ 669.0 | $ 1,829.0 | $ 1,502.0 |
Cash provided by operating activities - discontinued operations | 65.0 | 497.0 | 507.0 |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 734.0 | 2,326.0 | 2,009.0 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Proceeds from investments | 68.0 | 43.0 | 220.0 |
Payments for investments | (64.0) | (64.0) | (266.0) |
Net purchases (sales) of short-term investments - non-fiduciary | (232.0) | 61.0 | 9.0 |
Acquisition of businesses, net of cash acquired | (1,029.0) | (879.0) | (16.0) |
Sale of businesses, net of cash sold | 4,246.0 | 107.0 | 205.0 |
Capital expenditures | (183.0) | (156.0) | (200.0) |
Cash provided by (used for) investing activities - continuing operations | 2,806.0 | (888.0) | (48.0) |
Cash provided by (used for) investing activities - discontinued operations | (19.0) | (66.0) | (90.0) |
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES | 2,787.0 | (954.0) | (138.0) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | (2,399.0) | (1,257.0) | (1,550.0) |
Advances from (to) affiliates | 0.0 | 0.0 | 0.0 |
Issuance of shares for employee benefit plans | (121.0) | (129.0) | (30.0) |
Issuance of debt | 1,654.0 | 3,467.0 | 5,351.0 |
Repayment of debt | (1,999.0) | (2,945.0) | (5,098.0) |
Cash dividends to shareholders | (364.0) | (345.0) | (323.0) |
Noncontrolling interests and other financing activities | (36.0) | (77.0) | (39.0) |
Cash provided by (used for) financing activities - continuing operations | (3,265.0) | (1,286.0) | (1,689.0) |
Cash used for financing activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH USED FOR FINANCING ACTIVITIES | (3,265.0) | (1,286.0) | (1,689.0) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 69.0 | (39.0) | (172.0) |
NET INCREASE IN CASH AND CASH EQUIVALENTS | 325.0 | 47.0 | 10.0 |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 431.0 | 384.0 | 374.0 |
CASH AND CASH EQUIVALENTS AT END OF YEAR | 756.0 | 431.0 | 384.0 |
Cash and cash equivalents of discontinued operations | 0.0 | 5.0 | 2.0 | $ 4.0
Aon plc |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Cash provided by (used for) operating activities - continuing operations | 2,787.0 | 2,705.0 | 695.0 |
Cash provided by operating activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 2,787.0 | 2,705.0 | 695.0 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Proceeds from investments | 224.0 | 0.0 | 0.0 |
Payments for investments | (261.0) | 0.0 | (13.0) |
Net purchases (sales) of short-term investments - non-fiduciary | 0.0 | 0.0 | 0.0 |
Acquisition of businesses, net of cash acquired | 0.0 | 0.0 | 0.0 |
Sale of businesses, net of cash sold | 0.0 | 0.0 | 0.0 |
Capital expenditures | 0.0 | 0.0 | 0.0 |
Cash provided by (used for) investing activities - continuing operations | (37.0) | 0.0 | (13.0) |
Cash provided by (used for) investing activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES | (37.0) | 0.0 | (13.0) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | (2,399.0) | (1,257.0) | (1,550.0) |
Advances from (to) affiliates | 426.0 | (2,008.0) | 232.0 |
Issuance of shares for employee benefit plans | (121.0) | (129.0) | (29.0) |
Issuance of debt | 544.0 | 1,879.0 | 1,318.0 |
Repayment of debt | (835.0) | (845.0) | (330.0) |
Cash dividends to shareholders | (364.0) | (345.0) | (323.0) |
Noncontrolling interests and other financing activities |  | 0.0 | 0.0 |
Cash provided by (used for) financing activities - continuing operations | (2,749.0) | (2,705.0) | (682.0) |
Cash used for financing activities - discontinued operations | 0.0 |  | 0.0 |
CASH USED FOR FINANCING ACTIVITIES | (2,749.0) | (2,705.0) | (682.0) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0.0 | 0.0 | 0.0 |
NET INCREASE IN CASH AND CASH EQUIVALENTS | 1.0 | 0.0 | 0.0 |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 0.0 | 0.0 | 0.0 |
CASH AND CASH EQUIVALENTS AT END OF YEAR | 1.0 | 0.0 | 0.0 |
Aon Corporation |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Cash provided by (used for) operating activities - continuing operations | 503.0 | (536.0) | 464.0 |
Cash provided by operating activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 503.0 | (536.0) | 464.0 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Proceeds from investments | 587.0 | 316.0 | 27.0 |
Payments for investments | (29.0) | (35.0) | (47.0) |
Net purchases (sales) of short-term investments - non-fiduciary | (215.0) | 70.0 | (42.0) |
Acquisition of businesses, net of cash acquired | 0.0 | (335.0) | 0.0 |
Sale of businesses, net of cash sold | 0.0 | 0.0 | 0.0 |
Capital expenditures | 0.0 | 0.0 | 0.0 |
Cash provided by (used for) investing activities - continuing operations | 343.0 | 16.0 | (62.0) |
Cash provided by (used for) investing activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES | 343.0 | 16.0 | (62.0) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | 0.0 | 0.0 | 0.0 |
Advances from (to) affiliates | 95.0 | 570.0 | (326.0) |
Issuance of shares for employee benefit plans | 0.0 | 0.0 | 0.0 |
Issuance of debt | 1,100.0 | 1,588.0 | 4,026.0 |
Repayment of debt | (1,150.0) | (2,088.0) | (4,746.0) |
Cash dividends to shareholders | 0.0 | 0.0 | 0.0 |
Noncontrolling interests and other financing activities | 0.0 | 0.0 | 0.0 |
Cash provided by (used for) financing activities - continuing operations | 45.0 | 70.0 | (1,046.0) |
Cash used for financing activities - discontinued operations | 0.0 |  | 0.0 |
CASH USED FOR FINANCING ACTIVITIES | 45.0 | 70.0 | (1,046.0) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0.0 | 0.0 | 0.0 |
NET INCREASE IN CASH AND CASH EQUIVALENTS | 891.0 | (450.0) | (644.0) |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 1,633.0 | 2,083.0 | 2,727.0 |
CASH AND CASH EQUIVALENTS AT END OF YEAR | 2,524.0 | 1,633.0 | 2,083.0 |
Other Non-Guarantor Subsidiaries |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Cash provided by (used for) operating activities - continuing operations | 2,010.0 | 2,768.0 | 2,016.0 |
Cash provided by operating activities - discontinued operations | 65.0 | 497.0 | 507.0 |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 2,075.0 | 3,265.0 | 2,523.0 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Proceeds from investments | 582.0 | 15.0 | 193.0 |
Payments for investments | (576.0) | (29.0) | (219.0) |
Net purchases (sales) of short-term investments - non-fiduciary | (17.0) | (9.0) | 51.0 |
Acquisition of businesses, net of cash acquired | (1,029.0) | (608.0) | (16.0) |
Sale of businesses, net of cash sold | 4,246.0 | 171.0 | 205.0 |
Capital expenditures | (183.0) | (156.0) | (200.0) |
Cash provided by (used for) investing activities - continuing operations | 3,023.0 | (616.0) | 14.0 |
Cash provided by (used for) investing activities - discontinued operations | (19.0) | (66.0) | (90.0) |
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES | 3,004.0 | (682.0) | (76.0) |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | 0.0 | 0.0 | 0.0 |
Advances from (to) affiliates | (4,975.0) | (3,037.0) | (2,339.0) |
Issuance of shares for employee benefit plans | 0.0 | 0.0 | (1.0) |
Issuance of debt | 10.0 | 0.0 | 7.0 |
Repayment of debt | (14.0) | (12.0) | (22.0) |
Cash dividends to shareholders | 0.0 | 0.0 | 0.0 |
Noncontrolling interests and other financing activities | (36.0) | (77.0) | (39.0) |
Cash provided by (used for) financing activities - continuing operations | (5,015.0) | (3,126.0) | (2,394.0) |
Cash used for financing activities - discontinued operations | 0.0 |  | 0.0 |
CASH USED FOR FINANCING ACTIVITIES | (5,015.0) | (3,126.0) | (2,394.0) |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 69.0 | (39.0) | (172.0) |
NET INCREASE IN CASH AND CASH EQUIVALENTS | 133.0 | (582.0) | (119.0) |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 660.0 | 1,242.0 | 1,361.0 |
CASH AND CASH EQUIVALENTS AT END OF YEAR | 793.0 | 660.0 | 1,242.0 |
Consolidating Adjustments |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |  |
Cash provided by (used for) operating activities - continuing operations | (4,631.0) | (3,108.0) | (1,673.0) |
Cash provided by operating activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | (4,631.0) | (3,108.0) | (1,673.0) |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |
Proceeds from investments | (1,325.0) | (288.0) | 0.0 |
Payments for investments | 802.0 | 0.0 | 13.0 |
Net purchases (sales) of short-term investments - non-fiduciary | 0.0 | 0.0 | 0.0 |
Acquisition of businesses, net of cash acquired | 0.0 | 64.0 | 0.0 |
Sale of businesses, net of cash sold | 0.0 | (64.0) | 0.0 |
Capital expenditures | 0.0 | 0.0 | 0.0 |
Cash provided by (used for) investing activities - continuing operations | (523.0) | (288.0) | 13.0 |
Cash provided by (used for) investing activities - discontinued operations | 0.0 | 0.0 | 0.0 |
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES | (523.0) | (288.0) | 13.0 |
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |  |
Share repurchase | 0.0 | 0.0 | 0.0 |
Advances from (to) affiliates | 4,454.0 | 4,475.0 | 2,433.0 |
Issuance of shares for employee benefit plans | 0.0 | 0.0 | 0.0 |
Issuance of debt | 0.0 | 0.0 | 0.0 |
Repayment of debt | 0.0 | 0.0 | 0.0 |
Cash dividends to shareholders | 0.0 | 0.0 | 0.0 |
Noncontrolling interests and other financing activities | 0.0 | 0.0 | 0.0 |
Cash provided by (used for) financing activities - continuing operations | 4,454.0 | 4,475.0 | 2,433.0 |
Cash used for financing activities - discontinued operations | 0.0 |  | 0.0 |
CASH USED FOR FINANCING ACTIVITIES | 4,454.0 | 4,475.0 | 2,433.0 |
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0.0 | 0.0 | 0.0 |
NET INCREASE IN CASH AND CASH EQUIVALENTS | (700.0) | 1,079.0 | 773.0 |
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | (1,862.0) | (2,941.0) | (3,714.0) |
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ (2,562.0) | $ (1,862.0) | $ (2,941.0) |

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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 25 -Paragraph 19A -URI http://asc.fasb.org/extlink&oid=96949009&loc=SL79513924-113897 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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