Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Long Term Purchase Commitments
TotalUnconditionalPurchaseObligationBalanceSheetAmount	$ 3,047
TotalUnconditionalPurchaseObligationBalanceSheetAmountRemainingForCurrentFiscalYear	78
Total Unconditional PurchaseObligationBalanceSheetAmountOneYearAfterFiscalYearEnd	447
Total Unconditional Purchase Obligation Balance Sheet Amount Two Years After Fiscal Year End	444
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	1,002
TotalUnconditionalPurchaseObligationBalanceSheetAmountFourYearsAfterFiscalYearEnd	383
Total Unconditional Purchase Obligation Balance Sheet Amount Five Years After Fiscal Year End	157
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	536
Developer/Licensor Commitments - Royalty and Non-Royalty Bearing
Long Term Purchase Commitments
Unrecorded Total	987
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	26
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	224
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	229
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	205
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	222
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 Total	355
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	9
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	86
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	83
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	77
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	73
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	27
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Operating leases
Long Term Purchase Commitments
Unrecorded Total	249
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	8
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	43
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	39
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	39
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	32
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	25
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	63
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Total	227
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	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
Long Term Purchase Commitments
Unrecorded Total	109
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	9
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	30
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	27
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 Unrecorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Unrecorded Total	1,927
Unrecorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	59
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	424
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	419
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	376
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	356
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	157
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	136
Total Recorded Unconditional Purchase Obligation [Domain]
Long Term Purchase Commitments
Recorded Total	1,120
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	19
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	23
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	25
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	626
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	400
Senior Notes and Interest
Long Term Purchase Commitments
Recorded Total	1,013
Senior Notes Interest
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation, Due in Remainder of Fiscal Year	13
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 Total	107
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	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