v3.10.0.1

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Investments, Owned, Federal Income Tax Note [Line Items]
U.S. tax reform provisional income tax charge (benefit)		$ 3,100
Deferred tax liability as a percentage of indefinitely reinvested earnings			24.00%
Minimum
Investments, Owned, Federal Income Tax Note [Line Items]
Foreign earnings expected to be indefinitely reinvested			$ 200
Maximum
Investments, Owned, Federal Income Tax Note [Line Items]
Foreign earnings expected to be indefinitely reinvested			$ 300
Forecast
Investments, Owned, Federal Income Tax Note [Line Items]
U.S. tax reform provisional income tax charge (benefit)	$ (389)

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