Investments (Schedule Of Available-For-Sale Securities Whose Value Is Below Amortized Cost) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 security		Dec. 31, 2012 security
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	$ 80,976		$ 82,901
Gross Unrealized Losses	1,265		320
Continuous Unrealized Loss Position, Total	20,161		4,959
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	416		444
Gross Unrealized Losses	115		198
Gross Unrealized OTTI	81		129
Number of Securities	101	[1]	148	[1]
Fair Value Decline, Greater Than 20% [Member] | Less than six months
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	1		34
Gross Unrealized Losses	1		9
Gross Unrealized OTTI			1
Number of Securities	4	[1]	14	[1]
Fair Value Decline, Greater Than 20% [Member] | Six months or greater, but less than nine months
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	59		15
Gross Unrealized Losses	19		10
Number of Securities	4	[1]	3	[1]
Fair Value Decline, Greater Than 20% [Member] | Twelve months or greater
Available For Sale Securities In Unrealized Loss Position With Loss Severity Greater Than 20 Percent [Line Items]
Fair Value	349		395
Gross Unrealized Losses	92		179
Gross Unrealized OTTI	$ 81		$ 128
Number of Securities	92	[1]	131	[1]

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