Provision (Benefit) for Income Taxes Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Foreign income (loss) in Income from continuing operations before income taxes	$ 20	$ 102	$ 119
Impairment Loss	2,700
Gain on remeasurement of equity-method investment	0	2,544	0
Taxes on undistributed earnings of foreign subsidiaries – net	0	(37)	99
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	(31)	(18)	(24)
Minimum tax credits	139	137
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	193	251
Employee Share-based Compensation Tax Benefit Excluded From Deferred Income Tax Assets	23	23
Cash payments for income taxes (net of refunds and including discontinued operations)	(136)	29	(50)
Unrecognized tax benefits	55	89	66
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	51
Total interest and penalties recognized as part of income tax provision	22	8	$ 9
Total interest and penalties accrued as uncertain tax positions	2	$ 24
Foreign tax credit [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	139
Unrecognized Tax Benefits Income Tax Penalties And Interest Expense Due To Currency Fluctuations [Member]
Income Tax Contingency [Line Items]
Total interest and penalties recognized as part of income tax provision	35
Federal [Member] | Federal Net Operating Loss And Charitable Contribution Carryforwards [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	$ 1,500