Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Long-term Purchase Commitment [Line Items]
Unrecorded Total	$ 1,558
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	58
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	441
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	407
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	189
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	170
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	126
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	167
Recorded Total	1,390
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	46
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	717
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	106
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	35
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	30
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	23
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	433
TotalUnconditionalPurchaseObligationBalanceSheetAmount	2,948
TotalUnconditionalPurchaseObligationBalanceSheetAmountRemainingForCurrentFiscalYear	104
Total Unconditional PurchaseObligationBalanceSheetAmountOneYearAfterFiscalYearEnd	1,158
Total Unconditional Purchase Obligation Balance Sheet Amount Two Years After Fiscal Year End	513
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	224
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	200
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	149
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	600
Developer Commitments
Long-term Purchase Commitment [Line Items]
Unrecorded Total	796
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	27
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	249
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	252
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	108
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	93
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	63
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	4
Marketing [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	315
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	16
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	101
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	88
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	42
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	40
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	28
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Senior Notes Interest [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	145
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	7
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	41
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	20
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	20
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	19
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	19
Operating Lease Imputed Interest [Member] [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	20
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	2
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	6
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	3
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	105
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	6
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	44
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	43
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	8
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	2
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	2
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	1,014
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	14
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	600
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	400
Operating Lease [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Total	177
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	0
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	8
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	143
Recorded Total	243
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	20
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	68
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	55
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	25
Transition And Other Taxes [Member]
Long-term Purchase Commitment [Line Items]
Recorded Total	74
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	6
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	3
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	5
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	5
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	8
License obligations [Member]
Long-term Purchase Commitment [Line Items]
Recorded Total	59
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	6
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	26
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	27
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