Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Mar. 31, 2017 USD ($)
Long Term Purchase Commitments
TotalUnconditionalPurchaseObligationBalanceSheetAmount	$ 3,279
Total Unconditional Purchase Obligation Balance Sheet Amount One Year After Fiscal Year End	420
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	472
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	452
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	950
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	324
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	661
Developer And Licensor - Royalty and Non-Royalty Bearing [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	1,140
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	208
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	271
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	226
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	175
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	179
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	81
Marketing
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	445
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	78
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	83
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	116
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	72
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	72
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	24
Operating leases
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	212
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	35
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	34
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	31
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	29
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	22
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	61
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	258
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	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	78
Other Unrecorded Purchase Obligations [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	95
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	35
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	7
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	17
Total Unrecognized Commitments
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	2,150
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	394
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	448
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	427
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	324
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	296
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	261
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 Four	600
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	400
Licensing and lease obligations
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	126
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	23
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	26
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	28
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Total Recorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	1,129
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	26
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	626
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	28
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	$ 400