Commitments And Contingencies (Minimum Contractual Obligations) (Details) $ in Millions	Mar. 31, 2022 USD ($)
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	$ 3,828
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	681
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	779
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	702
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	556
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	185
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	925
Recorded Unconditional Purchase Obligation	2,278
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	86
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	71
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	57
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	450
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	29
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	1,585
TotalUnconditionalPurchaseObligationBalanceSheetAmount	6,106
Total Unconditional Purchase Obligation Balance Sheet Amount One Year After Fiscal Year End	767
TotalUnconditionalPurchaseObligationBalanceSheetAmountTwoYearsAfterFiscalYearEnd	850
TotalUnconditionalPurchaseObligationBalanceSheetAmountThreeYearsAfterFiscalYearEnd	759
Total Unconditional Purchase Obligation Balance Sheet Amount Four Years After Fiscal Year End	1,006
TotalUnconditionalPurchaseObligationBalanceSheetAmountFiveYearsAfterFiscalYearEnd	214
TotalUnconditionalPurchaseObligationBalanceSheetAmountThereafter	2,510
Developer Commitments [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	1,851
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	316
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	449
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	434
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	357
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	81
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	214
Marketing
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	837
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	231
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	206
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	191
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	125
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	54
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	30
Senior Notes Interest
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	836
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	49
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	55
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	55
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	54
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	36
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	587
Operating Lease Imputed Interest [Member] [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	32
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	8
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	6
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	5
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	3
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	2
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	8
Operating Lease [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	138
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	8
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	7
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	13
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	11
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	86
Recorded Unconditional Purchase Obligation	353
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	78
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	67
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	51
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	43
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	29
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	85
Other Unrecorded Purchase Obligations [Member]
Long Term Purchase Commitments
Unrecorded Unconditional Purchase Obligation	134
Unrecorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	64
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Two	55
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Three	10
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Four	4
Unrecorded Unconditional Purchase Obligation, Due in Rolling Year Five	1
Unrecorded Unconditional Purchase Obligation, Due in Rolling after Year Five	0
Senior Notes Principal And Interest [Member]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	1,906
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	6
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	400
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	1,500
Transition And Other Taxes [Member]
Long Term Purchase Commitments
Recorded Unconditional Purchase Obligation	19
Recorded Unconditional Purchase Obligation, Due in Next Rolling Twelve Months	2
Recorded Unconditional Purchase Obligation, Due in Rolling Year Two	4
Recorded Unconditional Purchase Obligation, Due in Rolling Year Three	6
Recorded Unconditional Purchase Obligation, Due in Rolling Year Four	7
Recorded Unconditional Purchase Obligation, Due in Rolling Year Five	0
Recorded Unconditional Purchase Obligation, Due in Rolling after Year Five	$ 0