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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2016
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | $ 413 | $ 436 |
Cash provided by operating activities - discontinued operations | 0 | 64 |
Cash provided by (used for) operating activities | 413 | 500 |
Cash flows from investing activities |  |  |
Proceeds from investments | 23 | 29 |
Payments for investments | (36) | (32) |
Net sales (purchases) of short-term investments - non-fiduciary | 352 | (2,451) |
Acquisition of businesses, net of cash acquired | (50) | (149) |
Sale of businesses, net of cash sold | 1 | 4,193 |
Capital expenditures | (111) | (82) |
Cash provided by (used for) investing activities - continuing operations | 179 | 1,508 |
Cash used for investing activities - discontinued operations | 0 | (19) |
Cash provided by investing activities | 179 | 1,489 |
Cash flows from financing activities |  |  |
Share repurchase | (971) | (1,100) |
Advances from (to) affiliates | 0 | 0 |
Issuance of shares for employee benefit plans | (150) | (139) |
Issuance of debt | 2,552 | 1,651 |
Repayment of debt | (2,027) | (1,990) |
Cash dividends to shareholders | (187) | (182) |
Noncontrolling interests and other financing activities | (15) | (10) |
Cash provided by (used for) financing activities - continuing operations | (798) | (1,770) |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (798) | (1,770) |
Effect of exchange rates on cash and cash equivalents | (63) | 34 |
Net increase (decrease) in cash and cash equivalents | (269) | 253 |
Cash and cash equivalents at beginning of period | 756 | 431 |
Cash and cash equivalents at end of period | 487 | 684 |
Cash and cash equivalents from discontinued operations |  |  | $ 5
Aon plc |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | (126) | (118) |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | (126) | (118) |
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 | (971) | (1,100) |
Advances from (to) affiliates | 965 | 1,846 |
Issuance of shares for employee benefit plans | (150) | (139) |
Issuance of debt | 752 | 544 |
Repayment of debt | (272) | (835) |
Cash dividends to shareholders | (187) | (182) |
Noncontrolling interests and other financing activities | 0 | 0 |
Cash provided by (used for) financing activities - continuing operations | 137 | 134 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | 137 | 134 |
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 | 582 | 999 |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | 582 | 999 |
Cash flows from investing activities |  |  |
Proceeds from investments | 13 | 567 |
Payments for investments | (17) | (15) |
Net sales (purchases) of short-term investments - non-fiduciary | 296 | (2,440) |
Acquisition of businesses, net of cash acquired | 0 | 2 |
Sale of businesses, net of cash sold | 0 | 0 |
Capital expenditures | 0 | 0 |
Cash provided by (used for) investing activities - continuing operations | 292 | (1,886) |
Cash used for investing activities - discontinued operations | 0 | 0 |
Cash provided by investing activities | 292 | (1,886) |
Cash flows from financing activities |  |  |
Share repurchase | 0 | 0 |
Advances from (to) affiliates | (810) | 1,977 |
Issuance of shares for employee benefit plans | 0 | 0 |
Issuance of debt | 1,800 | 1,102 |
Repayment of debt | (1,461) | (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 | (471) | 1,929 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (471) | 1,929 |
Effect of exchange rates on cash and cash equivalents | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | 403 | 1,042 |
Cash and cash equivalents at beginning of period | 2,524 | 1,633 |
Cash and cash equivalents at end of period | 2,927 | 2,675 |
Other Non-Guarantor Subsidiaries |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | 759 | 1,056 |
Cash provided by operating activities - discontinued operations | 0 | 64 |
Cash provided by (used for) operating activities | 759 | 1,120 |
Cash flows from investing activities |  |  |
Proceeds from investments | 10 | 6 |
Payments for investments | (19) | (558) |
Net sales (purchases) of short-term investments - non-fiduciary | 56 | (11) |
Acquisition of businesses, net of cash acquired | (50) | (151) |
Sale of businesses, net of cash sold | 1 | 4,193 |
Capital expenditures | (111) | (82) |
Cash provided by (used for) investing activities - continuing operations | (113) | 3,397 |
Cash used for investing activities - discontinued operations | 0 | (19) |
Cash provided by investing activities | (113) | 3,378 |
Cash flows from financing activities |  |  |
Share repurchase | 0 | 0 |
Advances from (to) affiliates | (395) | (4,381) |
Issuance of shares for employee benefit plans | 0 | 0 |
Issuance of debt | 0 | 5 |
Repayment of debt | (294) | (5) |
Cash dividends to shareholders | 0 | 0 |
Noncontrolling interests and other financing activities | (15) | (10) |
Cash provided by (used for) financing activities - continuing operations | (704) | (4,391) |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | (704) | (4,391) |
Effect of exchange rates on cash and cash equivalents | (63) | 34 |
Net increase (decrease) in cash and cash equivalents | (121) | 141 |
Cash and cash equivalents at beginning of period | 793 | 660 |
Cash and cash equivalents at end of period | 672 | 801 |
Consolidation Adjustments |  |  |
Cash flows from operating activities |  |  |
Cash provided by (used for) operating activities - continuing operations | (802) | (1,501) |
Cash provided by operating activities - discontinued operations | 0 | 0 |
Cash provided by (used for) operating activities | (802) | (1,501) |
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 | 240 | 558 |
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 | 240 | 558 |
Cash used for financing activities - discontinued operations | 0 | 0 |
Cash used for financing activities | 240 | 558 |
Effect of exchange rates on cash and cash equivalents | 0 | 0 |
Net increase (decrease) in cash and cash equivalents | (550) | (930) |
Cash and cash equivalents at beginning of period | (2,562) | (1,862) |
Cash and cash equivalents at end of period | $ (3,112) | $ (2,792) |

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