Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Sep. 30, 2020 USD ($)
Long-term Purchase Commitment [Line Items]
Unrecorded Total	$ 3,004
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	202
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	575
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	526
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	507
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	507
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	386
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	301
Recorded Total	1,351
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	681
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	121
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	41
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	36
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	31
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	425
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	16
TotalUnconditionalPurchaseObligationBalanceSheetAmount	4,355
TotalUnconditionalPurchaseObligationBalanceSheetAmountRemainingForCurrentFiscalYear	883
Total Unconditional PurchaseObligationBalanceSheetAmountOneYearAfterFiscalYearEnd	696
Total Unconditional Purchase Obligation Balance Sheet Amount Two Years After Fiscal Year End	567
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	543
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	538
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	811
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	$ 317
Minimum
Long-term Purchase Commitment [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	7 years
Maximum
Long-term Purchase Commitment [Line Items]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract	15 years
Developer Commitments
Long-term Purchase Commitment [Line Items]
Unrecorded Total	$ 1,895
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	86
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	340
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	358
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	349
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	359
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	271
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	132
Marketing [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	668
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	65
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	145
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	120
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	118
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	109
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	78
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	33
Senior Notes Interest [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	112
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	17
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	20
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	18
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Operating Lease Imputed Interest [Member] [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	19
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	3
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	5
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	3
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	2
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	1
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	1
Other Unrecorded Purchase Obligations [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	130
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	31
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	65
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	21
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	5
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Senior Notes Principal And Interest [Member]
Long-term Purchase Commitment [Line Items]
Recorded Total	1,003
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	603
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	400
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Operating Lease [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	180
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	0
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	0
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	14
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	14
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	135
Recorded Total	243
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	44
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	70
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	38
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	32
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	18
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	16
Transition And Other Taxes [Member]
Long-term Purchase Commitment [Line Items]
Recorded Total	66
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	22
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	24
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	3
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	4
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	6
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	7
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
License obligations [Member]
Long-term Purchase Commitment [Line Items]
Recorded Total	39
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	12
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	27
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	0
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	$ 0