Other Intangible Assets Schedule of Other Intangible Assets (Narrative) (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
Amortization of deferred acquisition costs	$ 335	$ 309	$ 663	$ 604
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	2		2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	3		3
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1		1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	2		2
Finite-Lived Intangible Assets, Amortization Expense, Year Four	2		2
Finite-Lived Intangible Assets, Amortization Expense, Year Five	2		2
Hardy [Member]
Amortization of deferred acquisition costs	20		41
Amortization of Intangible Assets
Other Intangible Assets [Member] | Hardy [Member]
Amortization of deferred acquisition costs	4		13
Amortization expense included in other operating expenses	$ 2		$ 5