Short-Term and Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Total short-term debt	$ 250		$ 501
Total long-term debt	5,270		5,320
Short-term Debt [Member]
Current maturities of long-term debt	250		500
Unamortized premiums (discounts)			1
Total short-term debt	250		501
Long-term debt [Member]
Unamortized premiums (discounts)	(12)		(12)
Senior Long Term Notes	3,810		4,060
Capital Securities	1,213		1,213
Fair value hedge on interest rate swap	259		59
Total unamortized premiums discounts and fair value hedge - interest rate swap agreements	247		47
Total long-term debt	5,270		5,320
Parent Company [Member]
Total short-term debt	250		501
Total long-term debt	5,021		5,571
4.30% notes, due 2015 [Member] | Long-term debt [Member]
Senior Long Term Notes			250
LIBOR plus 3 bps notes, due 2017 [Member] | Long-term debt [Member]
Senior Long Term Notes	250	[1]	250	[1]
7.00% notes, due 2018 [Member] | Long-term debt [Member]
Senior Long Term Notes	200		200
LIBOR plus 110 bps loan, due 2018 [Member] | Long-term debt [Member]
Senior Long Term Notes	250		250
8.75% notes, due 2019 [Member] | Long-term debt [Member]
Senior Long Term Notes	487	[2]	487	[2]
6.25% notes, due 2020 [Member] | Long-term debt [Member]
Senior Long Term Notes	300	[2]	300	[2]
4.85% notes, due 2021 [Member] | Long-term debt [Member]
Senior Long Term Notes	300	[2]	300	[2]
4.20% notes, due 2022 [Member] | Long-term debt [Member]
Senior Long Term Notes	300	[2]	300	[2]
4.00% notes, due 2023 [Member] | Long-term debt [Member]
Senior Long Term Notes	350	[2]	350	[2]
6.15% notes, due 2036 [Member] | Long-term debt [Member]
Senior Long Term Notes	498	[2]	498	[2]
6.30% notes, due 2037 [Member] | Long-term debt [Member]
Senior Long Term Notes	375	[1],[2]	375	[1],[2]
7.00% notes, due 2040 [Member] | Long-term debt [Member]
Senior Long Term Notes	500	[1],[2]	500	[1],[2]
7.00%, due 2066 [Member] | Long-term debt [Member]
Capital Securities	722		722
6.05%, due 2067 [Member] | Long-term debt [Member]
Capital Securities	$ 491		$ 491

[1] Categorized as operating debt for leverage ratio calculations as the proceeds were used as a long-term structured solution to reduce the strain on increasing statutory reserves associated with secondary guarantee UL and term policies.

[2] We have the option to repurchase the outstanding notes by paying the greater of 100% of the principal amount of the notes to be redeemed or the make-whole amount (as defined in each note agreement), plus in each case any accrued and unpaid interest as of the date of redemption.