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Fair Value - Fair Value Measurements on a Recurring Basis (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Mar. 31, 2018
Recurring    
Assets:    
Money market funds and money market deposit accounts $ 75 $ 84
Time deposits 124 114
Other debt securities 53 59
Deferred purchase price receivable 598 233
Total assets 850 490
Liabilities:    
Contingent consideration 41 5
Total liabilities 41 5
Recurring | Level 1    
Assets:    
Money market funds and money market deposit accounts 75 84
Time deposits 124 114
Other debt securities 0 0
Deferred purchase price receivable 0 0
Total assets 199 198
Liabilities:    
Contingent consideration 0 0
Total liabilities 0 0
Recurring | Level 2    
Assets:    
Money market funds and money market deposit accounts 0 0
Time deposits 0 0
Other debt securities 48 53
Deferred purchase price receivable 0 0
Total assets 48 53
Liabilities:    
Contingent consideration 0 0
Total liabilities 0 0
Recurring | Level 3    
Assets:    
Money market funds and money market deposit accounts 0 0
Time deposits 0 0
Other debt securities 5 6
Deferred purchase price receivable 598 233
Total assets 603 239
Liabilities:    
Contingent consideration 41 5
Total liabilities 41 5
Other Debt Obligations    
Liabilities:    
Cost basis 39 42
Unrealized gains $ 9 $ 11