Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014	Dec. 31, 2012
Income Taxes, Tax Rate [Line Items]
Unrecognized Tax Benefits	$ 1,080		$ 1,080			$ 1,052
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	940		940			902
Interest Expense Related To Income Taxes	9	15	28	26
Gross interest and penalties recognized in period			43
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Effective Income Tax Rate, Continuing Operations	87.60%	(0.10%)	18.90%	0.70%
Effective Tax Rate	13.10%	16.10%	13.70%	15.20%
Impact of certain receipts charges	(74.50%)	16.20%	(5.20%)	14.50%
Incremental tax liability asserted by IRS	1,162		1,162
Accrued Interest And Penalties Gross	408		408			364
Potential Reduction In Unrecognized Tax Benefits Over Next Twelve Months As Result Of Concluding Certain Matters					$ 41