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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FORD) OPERATING ACTIVITIES | $ 1,475 | $ 1,295
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from investments | 31 | 23
Purchases of investments | (47) | (3)
Net purchases of short-term investments - non-fiduciary | (108) | (9)
Acquisition of businesses, net of cash acquired | (198) | (26)
Proceeds from sale of businesses | 104 | 54
Capital expenditures | (153) | (225)
CASH USED FOR INVESTING ACTIVITIES | (371) | (186)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | (1,037) | (1,150)
Advances from (to) affiliates | 0 | 0
Issuance of shares for employee benefit plans | (70) | (148)
Issuance of debt | 2,729 | 3,494
Repayment of debt | (2,308) | (2,860)
Cash dividends to shareholders | (258) | (240)
Noncontrolling interests and other financing activities | (71) | (26)
CASH USED FOR FINANCING ACTIVITIES | (1,015) | (930)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 10 | (155)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 99 | 24
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 384 | 374
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 483 | 398
Aon plc [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FORD) OPERATING ACTIVITIES | 219 | 251
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from investments | 0 | 0
Purchases of investments | 0 | 0
Net purchases 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 | (1,037) | (1,150)
Advances from (to) affiliates | 166 | 630
Issuance of shares for employee benefit plans | (70) | (148)
Issuance of debt | 1,588 | 768
Repayment of debt | (608) | (111)
Cash dividends to shareholders | (258) | (240)
Noncontrolling interests and other financing activities | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | (219) | (251)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 0 | 0
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 0 | 0
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 0 | 0
Aon Corporation [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FORD) OPERATING ACTIVITIES | (664) | (624)
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from investments | 19 | 3
Purchases of investments | (25) | (1)
Net purchases of short-term investments - non-fiduciary | (99) | (51)
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 | (105) | (49)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | 356 | 451
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 1,141 | 2,720
Repayment of debt | (1,692) | (2,735)
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | (195) | 436
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | (964) | (237)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 2,083 | 2,727
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 1,119 | 2,490
Other Non-Guarantor Subsidiaries [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FORD) OPERATING ACTIVITIES | 1,920 | 1,668
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from investments | 12 | 20
Purchases of investments | (22) | (2)
Net purchases of short-term investments - non-fiduciary | (9) | 42
Acquisition of businesses, net of cash acquired | (198) | (26)
Proceeds from sale of businesses | 104 | 54
Capital expenditures | (153) | (225)
CASH USED FOR INVESTING ACTIVITIES | (266) | (137)
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | (670) | (1,616)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 0 | 6
Repayment of debt | (8) | (14)
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | (71) | (26)
CASH USED FOR FINANCING ACTIVITIES | (749) | (1,650)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 10 | (155)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 915 | (274)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | 1,242 | 1,361
CASH AND CASH EQUIVALENTS AT END OF PERIOD | 2,157 | 1,087
Consolidating Adjustments [Member] |  |
CASH FLOWS FROM OPERATING ACTIVITIES |  |
CASH PROVIDED BY (USED FORD) OPERATING ACTIVITIES | 0 | 0
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Proceeds from investments | 0 | 0
Purchases of investments | 0 | 0
Net purchases 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 from (to) affiliates | 148 | 535
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
Noncontrolling interests and other financing activities | 0 | 0
CASH USED FOR FINANCING ACTIVITIES | 148 | 535
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 0 | 0
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS | 148 | 535
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD | (2,941) | (3,714)
CASH AND CASH EQUIVALENTS AT END OF PERIOD | $ (2,793) | $ (3,179)

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