Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended
	Sep. 30, 2014 security		Dec. 31, 2013 security
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	$ 86,180		$ 80,976
Continuous Unrealized Loss Position, Total	12,307		20,161
Fair Value Decline, Greater Than 20% [Member]
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	257		416
Gross Unrealized Losses	58		115
Gross Unrealized OTTI	58		81
Number of Securities	83	[1]	101	[1]
Fair Value Decline, Greater Than 20% [Member] | Less Than Six Months [Member]
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	14		1
Gross Unrealized Losses			1
Gross Unrealized OTTI	7
Number of Securities	3	[1]	4	[1]
Fair Value Decline, Greater Than 20% [Member] | Six Months Or Greater, But Less Than Nine Months [Member]
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value			7
Gross Unrealized Losses			3
Number of Securities			1	[1]
Fair Value Decline, Greater Than 20% [Member] | Nine months or greater, but less than twelve months
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	1		59
Gross Unrealized Losses			19
Number of Securities	3	[1]	4	[1]
Fair Value Decline, Greater Than 20% [Member] | Twelve Months Or Greater [Member]
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	242		349
Gross Unrealized Losses	58		92
Gross Unrealized OTTI	$ 51		$ 81
Number of Securities	77	[1]	92	[1]

[1] We may reflect a security in more than one aging category based on various purchase dates.