Stockholders' Equity (Schedule of Changes in Stockholders' Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stockholders' equity, December 31, 2011	$ 4,280
Net earnings	97	178
Net Income (Loss) Attributable to Noncontrolling Interest	5	9
Net Income (Loss) Attributable to Parent	92	169
Other comprehensive income	97
Comprehensive Income (Loss)	194	270
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest	7	2
Stock Issued During Period, Value, New Issues	1
Treasury Stock	10
Additional paid-in capital	15
Dividends declared on common stock	(42)
Stockholders' equity, March 31, 2012	4,458
Parent [Member]
Stockholders' equity, December 31, 2011	4,181
Net Income (Loss) Attributable to Parent	92
Other comprehensive income	95
Comprehensive Income (Loss)	187
Stock Issued During Period, Value, New Issues	1
Treasury Stock	10
Additional paid-in capital	15
Dividends declared on common stock	(39)
Stockholders' equity, March 31, 2012	4,355
Noncontrolling Interest [Member]
Stockholders' equity, December 31, 2011	99
Other comprehensive income	2
Stock Issued During Period, Value, New Issues	0
Treasury Stock	0
Additional paid-in capital	0
Dividends declared on common stock	(3)
Stockholders' equity, March 31, 2012	$ 103