Other Intangible Assets Schedule of Other Intangible Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Amortization of deferred acquisition costs	$ 341	$ 333	$ 1,004	$ 937
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	1		1
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	4		4
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	25	20	66	20
Other Intangible Assets [Member] | Hardy [Member]
Amortization of deferred acquisition costs	1	18	14	18
Amortization expense included in other operating expenses	$ (1)	$ 6	$ 4	$ 6