Income Taxes [Line Items]

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Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due beyond one year or the operating cycle, whichever is longer. Alternate captions include income taxes payable, noncurrent.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Jun. 30, 2018
Income Taxes [Line Items]
Effective tax rate	14.00%	18.00%
U.S. federal statutory tax rate	21.00%		35.00%
Provision for income taxes	$ 1,397	$ 1,408
Long-term income taxes	28,936			$ 30,265
Tax Cuts and Jobs Act
Income Taxes [Line Items]
Provision for income taxes				13,700
Charge related to transition tax				17,900
Benefit from impact of changes in tax rate				4,200
Tax Contingencies and Other Income Tax Liabilities
Income Taxes [Line Items]
Long-term income taxes	$ 15,200			$ 15,100