Medium- And Long-Term Debt (Schedule Of Medium- And Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified							9 Months Ended		12 Months Ended		9 Months Ended				9 Months Ended	12 Months Ended	9 Months Ended					12 Months Ended				12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended				9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Parent Company	Dec. 31, 2013 Parent Company	Sep. 30, 2014 Subsidiaries	Dec. 31, 2013 Subsidiaries	Sep. 30, 2014 4.80% subordinated notes due 2015 Parent Company		Dec. 31, 2013 4.80% subordinated notes due 2015 Parent Company		Sep. 30, 2014 3.80% subordinated notes due 2026 Parent Company		Dec. 31, 2013 3.80% subordinated notes due 2026 Parent Company		Sep. 30, 2014 3.00% notes due 2015 Parent Company	Dec. 31, 2013 3.00% notes due 2015 Parent Company	Sep. 30, 2014 2.125% notes due 2019 Parent Company		Jun. 30, 2014 2.125% notes due 2019 Parent Company	Dec. 31, 2013 2.125% notes due 2019 Parent Company		Dec. 31, 2013 5.70% subordinated notes due 2014 Subsidiaries		Sep. 30, 2014 5.70% subordinated notes due 2014 Subsidiaries		Dec. 31, 2013 8.375% subordinated notes called 2014 Subsidiaries	Sep. 30, 2014 8.375% subordinated notes called 2014 Subsidiaries	Sep. 30, 2014 5.75% subordinated notes due 2016 Subsidiaries		Dec. 31, 2013 5.75% subordinated notes due 2016 Subsidiaries		Sep. 30, 2014 5.20% subordinated notes due 2017 Subsidiaries		Dec. 31, 2013 5.20% subordinated notes due 2017 Subsidiaries		Sep. 30, 2014 7.875% subordinated notes due 2026 Subsidiaries		Dec. 31, 2013 7.875% subordinated notes due 2026 Subsidiaries		Dec. 31, 2013 Federal Home Loan Bank advances floating-rate based on LIBOR indices due 2014 Subsidiaries	Sep. 30, 2014 Federal Home Loan Bank advances floating-rate based on LIBOR indices due 2014 Subsidiaries	Sep. 30, 2014 6.0% - 6.4% fixed-rate notes due 2020 Subsidiaries	Dec. 31, 2013 6.0% - 6.4% fixed-rate notes due 2020 Subsidiaries
Debt Instruments [Line Items]
Subordinated notes					$ 1,444	$ 1,898	$ 308	[1]	$ 318	[1]	$ 249	[1]	$ 0	[1]								$ 255	[1]	$ 0	[1]	$ 183	$ 0	$ 672	[1]	$ 681	[1]	$ 551	[1]	$ 566	[1]	$ 221	[1]	$ 213	[1]
Medium-term notes															299	299	346	[1]		0	[1]
Federal Home Loan Bank advances																																								1,000	0
Other Notes																																										23	28
Total medium- and long-term debt	$ 2,669	$ 3,543	$ 1,202	$ 617	$ 1,467	$ 2,926
Stated interest rate							4.80%		4.80%		3.80%				3.00%	3.00%	2.125%		2.125%			5.70%				8.375%	8.375%	5.75%		5.75%		5.20%		5.20%		7.875%		7.875%
Fixed Interest Rate - minimum																																										6.00%	6.00%
Fixed Interest Rate - maximum																																										6.40%	6.40%
Maturity Date							May 01, 2015		May 01, 2015		Jul. 22, 2026				Sep. 16, 2015	Sep. 16, 2015	May 23, 2019					Jun. 01, 2014				Jul. 15, 2024		Nov. 21, 2016		Nov. 21, 2016		Aug. 22, 2017		Aug. 22, 2017		Sep. 15, 2026		Sep. 15, 2026		May 07, 2014		Jun. 30, 2020	Jun. 30, 2020
Earliest call date																										Jul. 15, 2014

[1] The carrying value of medium- and long-term debt has been adjusted to reflect the gain or loss attributable to the risk hedged with interest rate swaps.