Other Comprehensive Income (Loss) (Schedule of Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Components Of Accumulated Other Comprehensive Income [Line Items]
Unrealized Gains and Losses on Available-for-Sale Securities, Beginning Balance			$ 4
Pension and Postretirement Plans, Beginning Balance			(3,451)
Foreign Currency Items, Beginning Balance			140
Total, Beginning Balance			(3,307)
Other comprehensive income before reclassifications, Unrealized Gains and Losses on Available-for-Sale Securities			(1)
Other comprehensive income before reclassifications, Pension and Postretirement Plans			121
Other comprehensive income before reclassifications, Foreign Currency Items			(340)
Other comprehensive income before reclassifications, Total			(220)
Amounts reclassified from accumulated other comprehensive income, Amounts reclassified from accumulated other comprehensive income, Unrealized Gains and Losses on Available-for-Sale Securities			0
Amounts reclassified from accumulated other comprehensive income, Pension and Postretirement Plans			92
Amounts reclassified from accumulated other comprehensive income, Foreign Currency Items			0
Amounts reclassified from accumulated other comprehensive income, Total			92
Net current period other comprehensive income, Unrealized Gains and Losses on Available-for-Sale Securities	(1)	(1)	(1)	(3)
Net current period other comprehensive income, Pension and Postretirement Plans			213
Net current period other comprehensive income, Foreign Currency Items			(340)
Net current period other comprehensive income, Total			(128)
Unrealized Gains and Losses on Available-for-Sale Securities, Ending Balance	3		3
Pension and Postretirement Plans, Ending Balance	(3,238)		(3,238)
Foreign Currency Items, Ending Balance	(200)		(200)
Total, Ending Balance	$ (3,435)		$ (3,435)