Shareholders' Equity And Dividend Restrictions (Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated other comprehensive income before tax
Accumulated unrealized gains, net, on investments available for sale, before tax	$ 1,875	$ 1,489	$ 1,250
Other Comprehensive Income (Loss), before Reclassifications, before Tax	537	426	303
Reclassification adjustment for (gains) losses included in net income, before tax	(77)	(40)	(64)
Accumulated unrealized gains, net, on investments available for sale, before tax	2,335	1,875	1,489
Accumulated unrealized losses for pension obligations, before tax	(101)	(88)	(63)
Effect on other comprehensive income, before tax	83	(13)	(25)
Accumulated unrealized losses for pension obligations, before tax	(18)	(101)	(88)
Accumulated Other Comprehensive Income (Loss), Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, before Tax	(50)	(29)	(18)
Other Comprehensive Income (Loss), before Reclassifications, Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, before Tax	40	(19)	(5)
Other Comprehensive Income (Loss), Reclassification Adjustment for Life Deferred Acquisition Costs, Life Policy Reserves and Other, Before Tax	(6)	(2)	(6)
Other Comprehensive Income (Loss), Deferred Acquisition Costs, Life Policy Reserves and Other Adjustment, before Tax	34	(21)	(11)
Accumulated Other Comprehensive Income (Loss), Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, before Tax	(16)	(50)	(29)
Accumulated other comprehensive income, before tax	1,724	1,372	1,169
Change in unrealized gains, net, on investments available for sale, before tax	460	386	239
Accumulated other comprehensive income, before tax	2,301	1,724	1,372
Accumulated other comprehensive income, tax
Accumulated unrealized gains, net, on investments available for sale, tax	647	512	428
Other Comprehensive Income (Loss), Before Reclassifications, Tax	188	149	106
Reclassification adjustment for (gains) losses included in net income	(27)	(14)	(22)
Effect on other comprehensive income, tax	161	135	84
Accumulated unrealized gains, net, on investments available for sale, tax	808	647	512
Accumulated unrealized losses for pension obligations at end of period	(6)	(35)	(31)
Change in pension obligations	29	(4)	(9)
Accumulated unrealized losses for pension obligations at beginning of period	(35)	(31)	(22)
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Tax	(17)	(10)	(6)
Other Comprehensive Income (Loss), before Reclassifications, Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Tax	14	(7)	(2)
Reclassification adjustment for life deferred acquisition costs, life policy reserves and other, net, included in net income, tax	(2)	0	(2)
Changes in life deferred acquisition costs, tax	12	(7)	(4)
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Tax	(5)	(17)	(10)
Accumulated other comprehensive income at beginning of period	595	471	400
Effect on comprehensive income, tax	202	124	71
Accumulated other comprehensive income at end of period	797	595	471
Accumulated other comprehensive income net of tax
Accumulated Other Comprehensive Income Loss Unrealized Gains Losses On Available For Sale Securities Net Of Tax	1,228	977	822
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	349	277	197
Reclassification adjustment for (gains) losses included in net income, net of tax	(50)	(26)	(42)
Accumulated Other Comprehensive Income Loss Unrealized Gains Losses On Available For Sale Securities Net Of Tax	1,527	1,228	977
Accumulated unrealized losses for pension obligations at beginning of period, net of tax	(66)	(57)	(41)
Effect on other comprehensive income, net of tax	54	(9)	(16)
Accumulated unrealized losses for pension obligations at beginning of period, net of tax	(12)	(66)	(57)
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Net of Tax	(33)	(19)	(12)
Other Comprehensive Income (Loss), before Reclassifications, Unrealized Gains Losses On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Net of Tax	26	(12)	(3)
Reclassification adjustment for life deferred acquisition costs, life policy reserves and other, net, included in net income, net of tax	(4)	(2)	(4)
Other Comprehensive Income (Loss), Deferred Acquistion Costs And Life Policy Reserves And Other, Net of Tax, Period Increase (Decrease)	22	(14)	(7)
Accumulated Other Comprehensive Income (Loss), Unrealized Gain (Loss) On Life Deferred Acquisition Costs And Life Policy Reserves And Other, Net of Tax	(11)	(33)	(19)
Accumulated other comprehensive income at beginning of period, net of tax	1,129	901	769
Change in unrealized gains, net, on investments available for sale, net of tax	299	251	155
Effect on other comprehensive income, net of tax	375	228	132
Accumulated other comprehensive income at beginning of period, net of tax	1,504	1,129	901
Increase Decrease In Other Comprehensive Income Loss Before Tax	$ 577	$ 352	$ 203