Quarterly Financial Data (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes	$ 421	$ 23	$ 71	$ 89
Gain on sale of assets, after tax, per share	$ 0.70	$ 0.04	$ 0.11	$ 0.14
Equity Sold, Percentage			50.00%
Asset abandonments and impairments, after tax	$ 50	$ 35	$ 28	$ 26
Impairment Effect on Earnings Per Share, after Tax	$ 0.08	$ 0.06	$ 0.04	$ 0.04
Restructuring and exit costs, after tax	$ 33	$ 26				$ 20
Restructuring and exit costs, after tax, per share	$ 0.06	$ 0.04				$ 0.03
Extinguishment of Debt, Gain (Loss), Net of Tax		$ 118
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax		$ 0.19
Other Charges, After Tax	$ 58
Other Charges, After Tax, Per Share	$ 0.10
Prior period income recognized in the current period, after tax	$ 34			$ 61
Prior Period Income Recognized in the Current Period, after tax, Per Share	$ 0.05			$ 0.09
Gain on equity dilution, after tax					$ 97
Gain on equity dilution, after tax, per share					$ 0.15
Loss on foreign exchange hedges, after tax					$ 63
Loss on foreign exchange hedges, after tax, per share					$ 0.10
Valuation Allowance on Deferred Tax Assets, Recognized in Earnings	$ 66
Valuation Allowance on Deferred Tax Assets, Recognized in Earnings, Per Share	$ 0.11
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs, after tax				$ 21
Restructuring and exit costs, after tax, per share				$ 0.03
Pension plan settlement [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and exit costs, after tax				$ 61
Restructuring and exit costs, after tax, per share				$ 0.09