Summary of Accounting Policies (Schedule of Change in Accounting Policy For Pension and Other Postretirement Benefits - Consolidated Statements of Cash Flows) (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 benefit expense	(35)	9	30
Pension and postretirement contributions	(96)	(288)	(209)
Actuarial (gain) loss on pension and postretirement plans	(104)	389	306
Pension curtailments and settlements, net	(52)	0	0
Deferred income taxes, net	344	(175)	(15)
Other liabilities	12	(24)	(101)
Previous Accounting Method [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss)	912	605	607
Pension and postretirement benefit expense	0	0	0
Pension and postretirement contributions	0	0	0
Actuarial (gain) loss on pension and postretirement plans	0	0	0
Pension curtailments and settlements, net	0
Deferred income taxes, net	242	(73)	93
Other liabilities	16	(249)	(262)
Effect of Change [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net earnings (loss)	189	(233)	(180)
Pension and postretirement benefit expense	(35)	9	30
Pension and postretirement contributions	(96)	(288)	(209)
Actuarial (gain) loss on pension and postretirement plans	(104)	389	306
Pension curtailments and settlements, net	(52)
Deferred income taxes, net	102	(102)	(108)
Other liabilities	$ (4)	$ 225	$ 161