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Guarantee of Registered Securities - Condensed Consolidating Statement of Cash Flows (Details) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | $ 1,163 | $ 975
Cash flows from investing activities |  |
Proceeds from investments | 33 | 30
Payments for investments | (94) | (65)
Net sales (purchases) of short-term investments - non-fiduciary | (7) | 356
Acquisition of businesses, net of cash acquired | (39) | (50)
Sale of businesses, net of cash sold | 43 | (8)
Capital expenditures | (167) | (179)
Cash provided by (used for) investing activities | (231) | 84
Cash flows from financing activities |  |
Share repurchase | (1,507) | (1,272)
Advances from (to) affiliates | 0 | 0
Issuance of shares for employee benefit plans | (133) | (139)
Issuance of debt | 4,918 | 3,960
Repayment of debt | (3,858) | (3,498)
Cash dividends to shareholders | (307) | (285)
Noncontrolling interests and other financing activities | (81) | (21)
Cash used for financing activities | (968) | (1,255)
Effect of exchange rates on cash and cash equivalents | (18) | (76)
Net increase (decrease) in cash and cash equivalents | (54) | (272)
Cash and cash equivalents at beginning of period | 656 | 756
Cash and cash equivalents at end of period | 602 | 484
Aon plc |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 356 | (143)
Cash flows from investing activities |  |
Proceeds from investments |  | 0
Payments for investments | 0 | (12)
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 provided by (used for) investing activities | 0 | (12)
Cash flows from financing activities |  |
Share repurchase | (1,507) | (1,272)
Advances from (to) affiliates | 1,277 | 1,292
Issuance of shares for employee benefit plans | (133) | (139)
Issuance of debt | 2,099 | 1,258
Repayment of debt | (1,785) | (700)
Cash dividends to shareholders | (307) | (285)
Noncontrolling interests and other financing activities | 0 | 0
Cash used for financing activities | (356) | 154
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | 0 | (1)
Cash and cash equivalents at beginning of period | 0 | 1
Cash and cash equivalents at end of period | 0 | 0
Aon Corporation |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | (118) | 479
Cash flows from investing activities |  |
Proceeds from investments | 17 | 16
Payments for investments | (46) | (36)
Net sales (purchases) of short-term investments - non-fiduciary | (7) | 308
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 | (36) | 288
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | 79 | (1,564)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 2,816 | 2,701
Repayment of debt | (2,073) | (2,501)
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | 0 | 0
Cash used for financing activities | 822 | (1,364)
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | 668 | (597)
Cash and cash equivalents at beginning of period | 862 | 2,524
Cash and cash equivalents at end of period | 1,530 | 1,927
Other Non-Guarantor Subsidiaries |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | 1,578 | 2,258
Cash flows from investing activities |  |
Proceeds from investments | 16 | 14
Payments for investments | (49) | (29)
Net sales (purchases) of short-term investments - non-fiduciary | 0 | 48
Acquisition of businesses, net of cash acquired | (39) | (50)
Sale of businesses, net of cash sold | 43 | (8)
Capital expenditures | (167) | (179)
Cash provided by (used for) investing activities | (196) | (204)
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | (1,370) | (2,054)
Issuance of shares for employee benefit plans | 0 | 0
Issuance of debt | 3 | 1
Repayment of debt | 0 | (297)
Cash dividends to shareholders | 0 | 0
Noncontrolling interests and other financing activities | (81) | (21)
Cash used for financing activities | (1,448) | (2,371)
Effect of exchange rates on cash and cash equivalents | (18) | (76)
Net increase (decrease) in cash and cash equivalents | (84) | (393)
Cash and cash equivalents at beginning of period | 575 | 793
Cash and cash equivalents at end of period | 491 | 400
Consolidation Adjustments |  |
Cash flows from operating activities |  |
Cash provided by (used for) operating activities | (653) | (1,619)
Cash flows from investing activities |  |
Proceeds from investments |  | 0
Payments for investments | 1 | 12
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 | 1 | 12
Cash flows from financing activities |  |
Share repurchase | 0 | 0
Advances from (to) affiliates | 14 | 2,326
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 used for financing activities | 14 | 2,326
Effect of exchange rates on cash and cash equivalents | 0 | 0
Net increase (decrease) in cash and cash equivalents | (638) | 719
Cash and cash equivalents at beginning of period | (781) | (2,562)
Cash and cash equivalents at end of period | $ (1,419) | $ (1,843)

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