Summary of Accounting Policies (Schedule of Change in Accounting Policy For Pension and Other Postretirement Benefits - Consolidated Statements of Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss)	$ 1,101	$ 372	$ 427
Pension and postretirement benefits	58	(11)	0
Total other comprehensive income (loss), net of tax	85	1	0
Previous Accounting Method [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss)	912	605	607
Pension and postretirement benefits	247	(244)	(180)
Total other comprehensive income (loss), net of tax	274	(232)	(180)
Effect of Change [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss)	189	(233)	(180)
Pension and postretirement benefits	(189)	233	180
Total other comprehensive income (loss), net of tax	$ (189)	$ 233	$ 180