Investments (Borrowed Securities Repurchased Securities And Repurchased Reversed Repurchased Securities) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Securities Sold under Agreements to Repurchase	$ 90	$ 0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	104	0
Securities for Reverse Repurchase Agreements	298	300
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	341	344
Portion at Fair Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	211	93
Securities for Reverse Repurchase Agreements	310	311
Reported Value Measurement [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities Borrowed	$ 204	$ 93