Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Mar. 31, 2018 USD ($)
Long Term Purchase Commitments
TotalUnconditionalPurchaseObligationBalanceSheetAmount	$ 2,979
Total Unconditional Purchase Obligation Balance Sheet Amount One Year After Fiscal Year End	405
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	459
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	1,010
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	379
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	163
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	563
Developer And Licensor - Royalty and Non-Royalty Bearing [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	899
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	174
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	227
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	206
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	211
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	80
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	1
Marketing
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	358
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	89
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	87
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	79
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	75
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	28
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Operating leases
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	240
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	40
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	40
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	40
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	33
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	26
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	61
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	217
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	38
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	20
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	58
Other Unrecorded Purchase Obligations [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	110
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	32
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	35
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	14
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	9
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	6
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	14
Total Unrecognized Commitments
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	1,824
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	373
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	430
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	380
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	348
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	159
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	134
Transition tax [Member]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	50
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	5
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	4
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	4
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	4
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	4
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	29
License obligations [Member]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	102
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	26
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	27
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Senior Notes and Interest
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	1,003
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	3
Senior Notes
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	600
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	400
Total Recorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	1,155
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	32
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	29
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	630
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	31
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	4
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	$ 429