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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | $ 338 | $ 74
Cash flows from investing activities |  |
Proceeds from investments | 6 | 12
Payments for investments | (43) | (14)
Net sales (purchases) of short-term investments - non-fiduciary | (38) | 41
Acquisition of businesses, net of cash acquired | (334) | (15)
Sale of businesses, net of cash sold | 30 | 6
Capital expenditures | (59) | (57)
Cash used for investing activities | (438) | (27)
Cash flows from financing activities |  |
Share repurchase | (463) | (100)
Advances from (to) affiliates | 0 | 0
Issuance of shares for employee benefit plans | (112) | (98)
Issuance of debt | 2,060 | 871
Repayment of debt | (1,341) | (694)
Cash dividends to shareholders | (102) | (96)
Noncontrolling interests and other financing activities | 40 | (23)
Cash provided by (used for) financing activities | 82 | (140)
Effect of exchange rates on cash and cash equivalents | (82) | 37
Net increase (decrease) in cash and cash equivalents | (100) | (56)
Cash and cash equivalents at beginning of period | 790 | 656
Cash and cash equivalents at end of period | 690 | 600
Aon Ireland |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 0 | 0
Cash flows from investing activities |  |
Proceeds from investments | 0 | 0
Payments for investments | 0 | 0
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 |
Cash used for investing activities | 0 | 0
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | 0 | 0
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 | 0 | 0
Effect of exchange rates 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 UK |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 1,561 | (11)
Cash flows from investing activities |  |
Proceeds from investments |  | 0
Payments for investments | (450) | 0
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 |
Cash used for investing activities | (450) | 0
Cash flows from financing activities |  |
Share repurchase | (463) | (100)
Advances from (to) affiliates | (618) | 305
Issuance of shares for employee benefit plans | (112) | (98)
Issuance of debt | 457 | 384
Repayment of debt | (273) | (384)
Cash dividends to shareholders | (102) | (96)
Noncontrolling interests and other financing activities | 0 | 0
Cash provided by (used for) financing activities | (1,111) | 11
Effect of exchange rates 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 Global Holdings Limited |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 3,648 | 529
Cash flows from investing activities |  |
Proceeds from investments |  | 72
Payments for investments | (518) | 0
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 |
Cash used for investing activities | (518) | 72
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | (3,094) | (601)
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 | (3,094) | (601)
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | 36 | 0
Cash and cash equivalents at beginning of period | 0 | 0
Cash and cash equivalents at end of period | 36 | 0
Aon Corporation |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | (512) | (34)
Cash flows from investing activities |  |
Proceeds from investments | 2 | 8
Payments for investments | (30) | (9)
Net sales (purchases) of short-term investments - non-fiduciary | (28) | 9
Acquisition of businesses, net of cash acquired | 0 | 0
Sale of businesses, net of cash sold | 0 | 0
Capital expenditures | 0 | 0
Cash used for investing activities | (56) | 8
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | (2,044) | (265)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 1,603 | 485
Repayment of debt | (1,068) | (310)
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | 0 | 0
Cash provided by (used for) financing activities | (1,509) | (90)
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | (2,077) | (116)
Cash and cash equivalents at beginning of period | 2,271 | 862
Cash and cash equivalents at end of period | 194 | 746
Other Non-Guarantor Subsidiaries |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 852 | 143
Cash flows from investing activities |  |
Proceeds from investments | 4 | 4
Payments for investments | (13) | (77)
Net sales (purchases) of short-term investments - non-fiduciary | (10) | 32
Acquisition of businesses, net of cash acquired | (334) | (15)
Sale of businesses, net of cash sold | 30 | 6
Capital expenditures | (59) | (57)
Cash used for investing activities | (382) | (107)
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | (1,349) | (550)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 0 | 2
Repayment of debt | 0 | 0
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | 40 | (23)
Cash provided by (used for) financing activities | (1,309) | (571)
Effect of exchange rates on cash and cash equivalents | (82) | 37
Net increase (decrease) in cash and cash equivalents | (921) | (498)
Cash and cash equivalents at beginning of period | 2,619 | 3,473
Cash and cash equivalents at end of period | 1,698 | 2,975
Consolidation Adjustments |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | (5,211) | (553)
Cash flows from investing activities |  |
Proceeds from investments |  | (72)
Payments for investments | 968 | 72
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 used for investing activities | 968 | 0
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | 7,105 | 1,111
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt |  | 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 | 7,105 | 1,111
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | 2,862 | 558
Cash and cash equivalents at beginning of period | (4,100) | (3,679)
Cash and cash equivalents at end of period | $ (1,238) | $ (3,121)

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