Shareholders' Equity (Shareholders' Equity Activity) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance			$ 4,365	$ 7,033
Net Income (Loss)	$ (562)	$ (483)	(1,053)	(590)
Other Comprehensive Loss	(9)	114	134	(209)
Dividends Paid to Noncontrolling Interests			(7)	(18)
Common Stocks, Including Additional Paid in Capital	623		623
Issuance of Exchangeable Notes			97
Equity Awards Granted, Vested and Exercised			28	30
Other				(1)
Balance, ending balance	4,187	6,247	4,187	6,247
Capital in Excess of Par Value	6,250		6,250		$ 5,502
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	1	1
Capital in Excess of Par Value [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance			5,502	5,411
Common Stocks, Including Additional Paid in Capital	623		623
Issuance of Exchangeable Notes			97
Equity Awards Granted, Vested and Exercised			28	30
Other				0
Balance, ending balance	6,250	5,441	$ 6,250	5,441
Stock Issued During Period, Shares, New Issues			115
Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance			$ 442	2,427
Net Income (Loss)			(1,063)	(607)
Equity Awards Granted, Vested and Exercised			0	0
Balance, ending balance	(621)	1,820	(621)	1,820
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance			(1,641)	(881)
Other Comprehensive Loss			134	(209)
Equity Awards Granted, Vested and Exercised			0	0
Balance, ending balance	(1,507)	(1,090)	(1,507)	(1,090)
Noncontrolling Interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning balance			61	75
Net Income (Loss)			10	17
Dividends Paid to Noncontrolling Interests			(7)	(18)
Equity Awards Granted, Vested and Exercised			0	0
Other				(1)
Balance, ending balance	64	$ 75	64	$ 75
Sale of Stock [Domain]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Additional Paid in Capital	$ 623		$ 623