(Income Taxes) (Details) $ in Millions	8 Months Ended
	Aug. 31, 2017 USD ($)
Income Tax Information
Tax benefit related to reduction in company's unrecognized tax benefits	$ 57
Pre-tax benefit on associated accrued interest reversals	50
Continuing Operations [Member]
Income Tax Information
Tax benefit related to reduction in company's unrecognized tax benefits	53
Pre-tax benefit on associated accrued interest reversals	47
Discontinued Operations [Member]
Income Tax Information
Tax benefit related to reduction in company's unrecognized tax benefits	4
Pre-tax benefit on associated accrued interest reversals	3
2016 RTA [Member]
Income Tax Information
Other Tax Expense (Benefit)	$ 29