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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | $ 975 | $ 289 |
Cash provided by operating activities - discontinued operations | 0 | 64 |
Cash provided by (used for) operating activities | 975 | 353 |
Cash flows from investing activities |  |  |
Proceeds from investments | 30 | 43 |
Payments for investments | (65) | (55) |
Net sales (purchases) of short-term investments - non-fiduciary | 356 | (1,344) |
Acquisition of businesses, net of cash acquired | (50) | (172) |
Sale of businesses, net of cash sold | (8) | 4,194 |
Capital expenditures | (179) | (125) |
Cash provided by (used for) investing activities - continuing operations | 84 | 2,541 |
Cash used for investing activities - discontinued operations | 0 | (19) |
Cash provided by investing activities | 84 | 2,522 |
Cash flows from financing activities |  |  |
Share repurchase | (1,272) | (1,888) |
Advances from (to) affiliates | 0 | 0 |
Issuance of shares for employee benefit plans | (139) | (118) |
Issuance of debt | 3,960 | 1,651 |
Repayment of debt | (3,498) | (1,998) |
Cash dividends to shareholders | (285) | (274) |
Noncontrolling interests and other financing activities | (21) | (21) |
Cash provided by (used for) financing activities - continuing operations | (1,255) | (2,648) |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (1,255) | (2,648) |
Effect of exchange rates on cash and cash equivalents | (76) | 91 |
Net increase (decrease) in cash and cash equivalents | (272) | 318 |
Cash and cash equivalents at beginning of period | 756 | 431 |
Cash and cash equivalents at end of period | 484 | 749 |
Cash and cash equivalents from discontinued operations |  |  | $ 5
Aon plc |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | (143) | (135) |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | (143) | (135) |
Cash flows from investing activities |  |  |
Proceeds from investments | 0 | 0 |
Payments for investments | (12) | (16) |
Net sales (purchases) of short-term investments - non-fiduciary | 0 | 0 |
Acquisition of businesses, net of cash acquired | 0 | 0 |
Sale of businesses, net of cash sold | 0 | 0 |
Capital expenditures | 0 | 0 |
Cash provided by (used for) investing activities - continuing operations | (12) | (16) |
Cash used for investing activities - discontinued operations | 0 | 0 |
Cash provided by investing activities | (12) | (16) |
Cash flows from financing activities |  |  |
Share repurchase | (1,272) | (1,888) |
Advances from (to) affiliates | 1,292 | 2,722 |
Issuance of shares for employee benefit plans | (139) | (118) |
Issuance of debt | 1,258 | 544 |
Repayment of debt | (700) | (835) |
Cash dividends to shareholders | (285) | (274) |
Noncontrolling interests and other financing activities | 0 | 0 |
Cash provided by (used for) financing activities - continuing operations | 154 | 151 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | 154 | 151 |
Effect of exchange rates on cash and cash equivalents | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (1) | 0 |
Cash and cash equivalents at beginning of period | 1 | 0 |
Cash and cash equivalents at end of period | 0 | 0 |
Aon Corporation |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | 479 | 999 |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | 479 | 999 |
Cash flows from investing activities |  |  |
Proceeds from investments | 16 | 576 |
Payments for investments | (36) | (25) |
Net sales (purchases) of short-term investments - non-fiduciary | 308 | (1,328) |
Acquisition of businesses, net of cash acquired | 0 | 1 |
Sale of businesses, net of cash sold | 0 | 0 |
Capital expenditures | 0 | 0 |
Cash provided by (used for) investing activities - continuing operations | 288 | (776) |
Cash used for investing activities - discontinued operations | 0 | 0 |
Cash provided by investing activities | 288 | (776) |
Cash flows from financing activities |  |  |
Share repurchase | 0 | 0 |
Advances from (to) affiliates | (1,564) | 1,304 |
Issuance of shares for employee benefit plans | 0 | 0 |
Issuance of debt | 2,701 | 1,100 |
Repayment of debt | (2,501) | (1,150) |
Cash dividends to shareholders | 0 | 0 |
Noncontrolling interests and other financing activities | 0 | 0 |
Cash provided by (used for) financing activities - continuing operations | (1,364) | 1,254 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (1,364) | 1,254 |
Effect of exchange rates on cash and cash equivalents | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (597) | 1,477 |
Cash and cash equivalents at beginning of period | 2,524 | 1,633 |
Cash and cash equivalents at end of period | 1,927 | 3,110 |
Other Non-Guarantor Subsidiaries |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | 2,258 | 987 |
Cash provided by operating activities - discontinued operations | 0 | 64 |
Cash provided by (used for) operating activities | 2,258 | 1,051 |
Cash flows from investing activities |  |  |
Proceeds from investments | 14 | 11 |
Payments for investments | (29) | (571) |
Net sales (purchases) of short-term investments - non-fiduciary | 48 | (16) |
Acquisition of businesses, net of cash acquired | (50) | (173) |
Sale of businesses, net of cash sold | (8) | 4,194 |
Capital expenditures | (179) | (125) |
Cash provided by (used for) investing activities - continuing operations | (204) | 3,320 |
Cash used for investing activities - discontinued operations | 0 | (19) |
Cash provided by investing activities | (204) | 3,301 |
Cash flows from financing activities |  |  |
Share repurchase | 0 | 0 |
Advances from (to) affiliates | (2,054) | (4,274) |
Issuance of shares for employee benefit plans | 0 | 0 |
Issuance of debt | 1 | 7 |
Repayment of debt | (297) | (13) |
Cash dividends to shareholders | 0 | 0 |
Noncontrolling interests and other financing activities | (21) | (21) |
Cash provided by (used for) financing activities - continuing operations | (2,371) | (4,301) |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (2,371) | (4,301) |
Effect of exchange rates on cash and cash equivalents | (76) | 91 |
Net increase (decrease) in cash and cash equivalents | (393) | 142 |
Cash and cash equivalents at beginning of period | 793 | 660 |
Cash and cash equivalents at end of period | 400 | 802 |
Consolidation Adjustments |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | (1,619) | (1,562) |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | (1,619) | (1,562) |
Cash flows from investing activities |  |  |
Proceeds from investments | 0 | (544) |
Payments for investments | 12 | 557 |
Net sales (purchases) of short-term investments - non-fiduciary | 0 | 0 |
Acquisition of businesses, net of cash acquired |  | 0 |
Sale of businesses, net of cash sold | 0 | 0 |
Capital expenditures | 0 | 0 |
Cash provided by (used for) investing activities - continuing operations | 12 | 13 |
Cash used for investing activities - discontinued operations | 0 | 0 |
Cash provided by investing activities | 12 | 13 |
Cash flows from financing activities |  |  |
Share repurchase | 0 | 0 |
Advances from (to) affiliates | 2,326 | 248 |
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 provided by (used for) financing activities - continuing operations | 2,326 | 248 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | 2,326 | 248 |
Effect of exchange rates on cash and cash equivalents | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | 719 | (1,301) |
Cash and cash equivalents at beginning of period | (2,562) | (1,862) |
Cash and cash equivalents at end of period | $ (1,843) | $ (3,163) |

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