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Revisions of Previously Issued Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net     $ (60) $ (28)      
Net cash provided by (used in) operating activities     283 71      
Payments to Acquire Businesses, Net of Cash Acquired     25 12      
Increase (Decrease) in Client Funds Held     3 0      
Net Cash Provided by (Used in) Investing Activities     (154) (134)      
Net Cash Provided by (Used in) Financing Activities     1,057 (58)      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect     1,176 (131)      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period $ 1,273 $ 496 1,739 $ 401 $ 463 $ 563 $ 532
Previously Reported              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net (90) 10       2  
Net cash provided by (used in) operating activities 61 (16)       628  
Payments to Acquire Businesses, Net of Cash Acquired             206
Increase (Decrease) in Client Funds Held         (2) (15)  
Net Cash Provided by (Used in) Investing Activities         (292) (527) (520)
Net change in funds held for clients - financing   0     2 15 0
Net Cash Provided by (Used in) Financing Activities   36     33 (31) (58)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 717 (53) 476   (67) 40 (67)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 548 476 345   476 476 476
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period 1,265 423     409 516  
Revision of Prior Period, Error Correction, Adjustment              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net (7) 0       6  
Net cash provided by (used in) operating activities (7) 0       6  
Payments to Acquire Businesses, Net of Cash Acquired             46
Increase (Decrease) in Client Funds Held         2 15  
Net Cash Provided by (Used in) Investing Activities         2 15 46
Net change in funds held for clients - financing   17     (4) (30) 10
Net Cash Provided by (Used in) Financing Activities   17     (4) (30) 10
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (7) 17 56   (2) (9) 56
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 15 46 56   56 56 56
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period 8 63     54 47  
As Revised March 31, 2020 Form 10-Q              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net   10          
Net cash provided by (used in) operating activities   (16)          
Net change in funds held for clients - financing   17          
Net Cash Provided by (Used in) Financing Activities   53          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   (36)          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   522          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period   486          
Further Revision              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net   0          
Net cash provided by (used in) operating activities   0          
Net change in funds held for clients - financing   0          
Net Cash Provided by (Used in) Financing Activities   0          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect   0          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   10          
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period   10          
As Revised              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Increase (Decrease) in Other Operating Assets and Liabilities, Net (97) 10       8  
Net cash provided by (used in) operating activities 54 (16)       634  
Payments to Acquire Businesses, Net of Cash Acquired             160
Increase (Decrease) in Client Funds Held         0 0  
Net Cash Provided by (Used in) Investing Activities         (290) (512) (474)
Net change in funds held for clients - financing   17     (2) (15) 10
Net Cash Provided by (Used in) Financing Activities   53     29 (61) (48)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 710 (36) 532   (69) 31 (11)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 563 532 $ 401   532 532 $ 532
Cash, Cash Equivalents, Restricted Cash and Restricted Cash at end of period $ 1,273 $ 496     $ 463 $ 563