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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)