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	9 Months Ended		12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Income Taxes [Line Items]
Effective tax rate	16.00%		14.00%			16.00%	70.00%
U.S. federal statutory tax rate					35.00%		21.00%
Provision for income taxes	$ 1,677		$ 1,217			$ 5,039	$ 18,096
Long-term income taxes	29,514					29,514		$ 30,265
Tax Cuts and Jobs Act
Income Taxes [Line Items]
Provision for income taxes		$ 157		$ 13,800				13,700
Charge related to transition tax				17,800				17,900
Benefit from impact of changes in tax rate				$ 4,000				4,200
Income Tax Contingencies and Other Income Tax Liabilities
Income Taxes [Line Items]
Long-term income taxes	$ 15,700					$ 15,700		$ 15,100