Shareholders' Equity (Shareholders' Equity Activity) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Issued and Treasury Shares [Line Items]
Stockholders' Equity, Other		$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	$ 4,365	7,033
Net Income (Loss)	(491)	(107)
Other Comprehensive Loss	143	(323)
Dividends Paid to Noncontrolling Interests		(18)
Common Stocks, Including Additional Paid in Capital	623
Equity Awards Granted, Vested and Exercised	19	12
Balance, ending balance	4,659	6,598
Par Value of Issued Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	1	1
Equity Awards Granted, Vested and Exercised	0	0
Balance, ending balance	1	1
Capital in Excess of Par Value [Member]
Schedule of Issued and Treasury Shares [Line Items]
Stockholders' Equity, Other		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	5,502	5,411
Common Stocks, Including Additional Paid in Capital	623
Equity Awards Granted, Vested and Exercised	19	12
Balance, ending balance	6,144	5,423
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	442	2,427
Net Income (Loss)	(498)	(118)
Equity Awards Granted, Vested and Exercised	0	0
Balance, ending balance	(56)	2,309
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	(1,641)	(881)
Other Comprehensive Loss	143	(323)
Equity Awards Granted, Vested and Exercised	0	0
Balance, ending balance	(1,498)	(1,204)
Treasury Shares [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	0	0
Equity Awards Granted, Vested and Exercised	0	0
Balance, ending balance	0	0
Noncontrolling Interests [Member]
Schedule of Issued and Treasury Shares [Line Items]
Stockholders' Equity, Other		(1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance	61	75
Net Income (Loss)	7	11
Dividends Paid to Noncontrolling Interests		(18)
Equity Awards Granted, Vested and Exercised	0	0
Balance, ending balance	$ 68	$ 69