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Acquisitions, Disposals and Other Transactions (Fiscal 2020) (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Oct. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired   $ 0 $ 260  
Consideration transferred allocated to goodwill   $ 3,408   $ 3,409
Credible Labs Inc.        
Business Acquisition [Line Items]        
Business acquisition, percentage of equity acquired 67.00%      
Payments to acquire businesses, net of cash acquired $ 260      
Consideration transferred $ 260      
Final valuation, percentage of acquired business 100.00%      
Consideration transferred allocated to amortizable intangible assets $ 75      
Consideration transferred allocated to goodwill 285      
Consideration transferred allocated to redeemable noncontrolling interests $ (110)      
Credible Labs Inc. | Credible        
Business Acquisition [Line Items]        
Remaining percentage of equity not acquired by parent 33.00%      
Credible Labs Inc. | Minimum        
Business Acquisition [Line Items]        
Consideration transferred allocated to amortizable intangible assets, useful life 5 years      
Credible Labs Inc. | Maximum        
Business Acquisition [Line Items]        
Consideration transferred allocated to amortizable intangible assets, useful life 10 years