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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | $ 2,326 | $ 2,009 | $ 1,812
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Proceeds from investments | 43 | 220 | 52
Payments for investments | (64) | (266) | (20)
Net (purchases) sales of short-term investments - non-fiduciary | 61 | 9 | 110
Acquisition of businesses, net of cash acquired | (879) | (16) | (479)
Proceeds from sale of businesses | 107 | 205 | 48
Capital expenditures | (222) | (290) | (256)
CASH USED FOR INVESTING ACTIVITIES | (954) | (138) | (545)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Share repurchase | (1,257) | (1,550) | (2,250)
Advances from (to) affiliates and other (1) | 0 | 0 | 0
Issuance of shares for employee benefit plans | (129) | (30) | (105)
Issuance of debt | 3,467 | 5,351 | 5,239
Repayment of debt | (2,945) | (5,098) | (3,918)
Cash dividends to shareholders | (345) | (323) | (273)
Noncontrolling interests and other financing activities | (77) | (39) | 4
CASH USED FOR FINANCING ACTIVITIES | (1,286) | (1,689) | (1,303)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (39) | (172) | (67)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 47 | 10 | (103)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 384 | 374 | 477
CASH AND CASH EQUIVALENTS AT END OF YEAR | 431 | 384 | 374
Aon plc |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 2,705 | 695 | 769
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Proceeds from investments | 0 | 0 | 0
Payments for investments | 0 | (13) | 0
Net (purchases) sales of short-term investments - non-fiduciary | 0 | 0 | 0
Acquisition of businesses, net of cash acquired | 0 | 0 | 0
Proceeds from sale of businesses | 0 | 0 | 0
Capital expenditures | 0 | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | 0 | (13) | 0
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Share repurchase | (1,257) | (1,550) | (2,250)
Advances from (to) affiliates and other (1) | (2,008) | 232 | 19
Issuance of shares for employee benefit plans | (129) | (29) | (105)
Issuance of debt | 1,879 | 1,318 | 2,908
Repayment of debt | (845) | (330) | (1,068)
Cash dividends to shareholders | (345) | (323) | (273)
Noncontrolling interests and other financing activities |  | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | (2,705) | (682) | (769)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 0 | 0 | 0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 0 | 0 | 0
CASH AND CASH EQUIVALENTS AT END OF YEAR | 0 | 0 | 0
Aon Corporation |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | (536) | 464 | (927)
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Proceeds from investments | 316 | 27 | 39
Payments for investments | (35) | (47) | (20)
Net (purchases) sales of short-term investments - non-fiduciary | 70 | (42) | (3)
Acquisition of businesses, net of cash acquired | (335) | 0 | 0
Proceeds from sale of businesses | 0 | 0 | 0
Capital expenditures | 0 | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | 16 | (62) | 16
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Share repurchase | 0 | 0 | 0
Advances from (to) affiliates and other (1) | 570 | (326) | 3,215
Issuance of shares for employee benefit plans | 0 | 0 | 0
Issuance of debt | 1,588 | 4,026 | 2,326
Repayment of debt | (2,088) | (4,746) | (2,150)
Cash dividends to shareholders | 0 | 0 | 0
Noncontrolling interests and other financing activities | 0 | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | 70 | (1,046) | 3,391
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (450) | (644) | 2,480
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 2,083 | 2,727 | 247
CASH AND CASH EQUIVALENTS AT END OF YEAR | 1,633 | 2,083 | 2,727
Other Non-Guarantor Subsidiaries |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | 3,265 | 2,523 | 1,970
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Proceeds from investments | 15 | 193 | 13
Payments for investments | (29) | (219) | 0
Net (purchases) sales of short-term investments - non-fiduciary | (9) | 51 | 113
Acquisition of businesses, net of cash acquired | (608) | (16) | (479)
Proceeds from sale of businesses | 171 | 205 | 48
Capital expenditures | (222) | (290) | (256)
CASH USED FOR INVESTING ACTIVITIES | (682) | (76) | (561)
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Share repurchase | 0 | 0 | 0
Advances from (to) affiliates and other (1) | (3,037) | (2,339) | (536)
Issuance of shares for employee benefit plans | 0 | (1) | 0
Issuance of debt | 0 | 7 | 5
Repayment of debt | (12) | (22) | (700)
Cash dividends to shareholders | 0 | 0 | 0
Noncontrolling interests and other financing activities | (77) | (39) | 4
CASH USED FOR FINANCING ACTIVITIES | (3,126) | (2,394) | (1,227)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | (39) | (172) | (67)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (582) | (119) | 115
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | 1,242 | 1,361 | 1,246
CASH AND CASH EQUIVALENTS AT END OF YEAR | 660 | 1,242 | 1,361
Consolidating Adjustments |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |  |
CASH PROVIDED BY (USED FOR) OPERATING ACTIVITIES | (3,108) | (1,673) | 0
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |
Proceeds from investments | (288) | 0 | 0
Payments for investments | 0 | 13 | 0
Net (purchases) sales of short-term investments - non-fiduciary | 0 | 0 | 0
Acquisition of businesses, net of cash acquired | 64 | 0 | 0
Proceeds from sale of businesses | (64) | 0 | 0
Capital expenditures | 0 | 0 | 0
CASH USED FOR INVESTING ACTIVITIES | (288) | 13 | 0
CASH FLOWS FROM FINANCING ACTIVITIES |  |  |
Share repurchase | 0 | 0 | 0
Advances from (to) affiliates and other (1) | 4,475 | 2,433 | (2,698)
Issuance of shares for employee benefit plans | 0 | 0 | 0
Issuance of debt | 0 | 0 | 0
Repayment of debt | 0 | 0 | 0
Cash dividends to shareholders | 0 | 0 | 0
Noncontrolling interests and other financing activities | 0 | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | 4,475 | 2,433 | (2,698)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 1,079 | 773 | (2,698)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR | (2,941) | (3,714) | (1,016)
CASH AND CASH EQUIVALENTS AT END OF YEAR | $ (1,862) | $ (2,941) | $ (3,714)

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