Discontinued Operations (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Asset impairment charges	$ 241
Asset impairment charges after tax	235
Assets, fair value adjustment			$ 34
Assets fair value adjustment, net of tax			$ 27
Discontinued operation, loss from disposal of discontinued operation, before income tax		$ 6
Disposal group, held for sale or disposed of by sale, discontinued operation and not discontinued operation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal group, including discontinued operation, assets	660			$ 817
Disposal group, including discontinued operation, liabilities	$ 663			$ 750