Note 17 - Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions						1 Months Ended			3 Months Ended			4 Months Ended	10 Months Ended	11 Months Ended	12 Months Ended
	Jan. 22, 2016	Oct. 29, 2015	Mar. 04, 2014	Jan. 15, 2014	Jan. 15, 2014	May. 28, 2014	Jan. 31, 2014	Oct. 31, 2013	Jan. 22, 2016	May. 28, 2014	Mar. 31, 2014	Jan. 31, 2014	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013	Oct. 28, 2015	Oct. 26, 2015	Jul. 15, 2015	Dec. 03, 2014	Oct. 22, 2013
Note 17 - Shareholders' Equity (Details) [Line Items]
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)													$ 100		$ 100	$ 100
Stock Issued During Period, Value, Acquisitions																$ 1,915
Stock Issued During Period, Value, New Issues																400
Minimum Closing Price of Common Stock for the Company to Exercise Option to Convert Preferred Stock (in Dollars per share)				$ 35
Treasury Stock, Shares, Acquired (in Shares)													98,200,000	118,900,000	151,000,000
Treasury Stock, Value, Acquired, Cost Method													$ 2,000	$ 2,000	$ 3,228	2,483		$ 1,516
Other Comprehensive Income (Loss), Tax															(41)	(96)		197
Hedges [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Other Comprehensive Income (Loss), Tax															(35)	7		33
Postretirement Benefits [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Other Comprehensive Income (Loss), Tax															$ (6)	(104)		$ 164
Investment Gains [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Other Comprehensive Income (Loss), Tax																$ 1
Oct. 22, 2013 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount																							$ 2,000
Dec. 3, 2014 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount																						$ 1,500
Treasury Stock, Shares, Acquired (in Shares)															70,400,000
Treasury Stock, Value, Acquired, Cost Method															$ 1,500
July 15, 2015 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount																					$ 2,000
Oct. 26, 2015 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount																				$ 4,000
Dec. 3, 2014 & July 15, 2015 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Treasury Stock, Shares, Acquired (in Shares)															98,000,000
Treasury Stock, Value, Acquired, Cost Method															$ 2,000
Convertible Preferred Stock, Series A [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)				$ 100	$ 100
Preferred Stock, Dividend Rate, Percentage				4.25%
Convertible Preferred Stock, Threshold Trading Days				25 days
Convertible Preferred Stock, Threshold Consecutive Trading Days				40 days
Samsung Corning Precision Materials Co., Ltd. [Member] | Convertible Preferred Stock, Series A [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)				$ 100	$ 100
Stock Issued During Period, Shares, Acquisitions (in Shares)				1,900	2,300						1,900
Share Price (in Dollars per share)				$ 1,000,000	$ 1,000,000
Stock Issued During Period, Value, Acquisitions				$ 1,900	$ 2,300
Samsung Corning Precision Materials Co., Ltd. [Member] | Additional Amount Issued at Closing [Member] | Convertible Preferred Stock, Series A [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Issued During Period, Value, New Issues				$ 400							$ 400
JP Morgan Chase [Member] | April 24, 2013 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount								$ 1,000
Treasury Stock, Shares, Acquired (in Shares)							10,500,000	47,100,000				57,600,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt								$ (1,000)
Treasury Stock, Value, Acquired, Cost Method								800
Adjustments to Additional Paid in Capital, Other								$ (200)
Open Market [Member] | April 24, 2013 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Treasury Stock, Shares, Acquired (in Shares)																	61,300,000
Treasury Stock, Value, Acquired, Cost Method																	$ 1,000
Open Market [Member] | Jan 15, 2014 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Treasury Stock, Shares, Acquired (in Shares)																36,900,000
Treasury Stock, Value, Acquired, Cost Method																$ 750
Citibank [Member] | March 4, 2014 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount			$ 1,250
Treasury Stock, Shares, Acquired (in Shares)			52,500,000			8,700,000				61,200,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt			$ (1,250)
Morgan Stanley [Member] | Oct. 28, 2015 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Stock Repurchase Program, Authorized Amount																			$ 1,250
Treasury Stock, Shares, Acquired (in Shares)		53,100,000							69,000,000
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ (1,250)
Treasury Stock, Value, Acquired, Cost Method		1,000
Adjustments to Additional Paid in Capital, Other		$ (250)
Morgan Stanley [Member] | Subsequent Event [Member] | Oct. 28, 2015 [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Treasury Stock, Shares, Acquired (in Shares)	15,900,000
Common Stock [Member]
Note 17 - Shareholders' Equity (Details) [Line Items]
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares)				50,000	50,000