Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stockholders' equity, December 31, 2011			$ 4,280
Net earnings	120	(164)	217	14
Net Income (Loss) Attributable to Parent	113	(161)	205	8
Net Income (Loss) Attributable to Noncontrolling Interest	7	(3)	12	6
Other comprehensive income			(150)
Comprehensive Income (Loss)	(127)	(46)	67	224
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	5	8	12	10
Treasury Stock			28
Additional paid-in capital			26
Dividends declared on common stock			(84)
Stockholders' equity, June 30, 2012	4,318		4,318
Parent [Member]
Stockholders' equity, December 31, 2011			4,181
Net Income (Loss) Attributable to Parent	113		205
Other comprehensive income			(150)
Comprehensive Income (Loss)			55
Treasury Stock			28
Additional paid-in capital			26
Dividends declared on common stock			(78)
Stockholders' equity, June 30, 2012	4,213		4,213
Noncontrolling Interest [Member]
Stockholders' equity, December 31, 2011			99
Other comprehensive income			0
Stock Issued During Period, Value, New Issues			0
Treasury Stock			0
Additional paid-in capital			0
Dividends declared on common stock			(6)
Stockholders' equity, June 30, 2012	$ 105		$ 105