Income Taxes (Net Deferred Tax Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred tax assets	$ 12,486		$ 16,580
Deferred tax liabilities	(15,664)		(14,046)
Valuation allowance	(125)		(121)
Net deferred tax (liabilities)/assets	$ (3,303)	[1]	$ 2,413	[1]

[1] Of the deferred tax asset for net operating loss and credit carryovers, $295 expires in years ending from December 31, 2014 through December 31, 2033 and $67 may be carried over indefinitely. Included in the net deferred tax (liabilities)/assets as of December 31, 2013 and 2012 are deferred tax assets in the amounts of $5,818 and $10,210 related to Accumulated other comprehensive loss.