Short-Term and Long-Term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Total short-term debt			$ 250
Total long-term debt		$ 5,582	5,270
Short-term Debt [Member]
Current maturities of long-term debt			250
Total short-term debt			250
Long-term Debt [Member]
Unamortized premiums (discounts)		(12)	(12)
Senior Long Term Notes		4,110	3,810
Capital Securities		1,213	1,213
Fair value hedge on interest rate swap		271	259
Total unamortized premiums discounts and fair value hedge - interest rate swap agreements		259	247
Total long-term debt		5,582	5,270
Parent Company [Member]
Total short-term debt			250
Total long-term debt		5,331	5,021
LIBOR plus 3 bps notes, due 2017 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[1]	250	250
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	[2]	487	487
6.25% notes, due 2020 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	300	300
4.85% notes, due 2021 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	300	300
4.20% notes, due 2022 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	300	300
4.00% notes, due 2023 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	350	350
3.35% notes, due 2025 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	300
6.15% notes, due 2036 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	498	498
6.30% notes, due 2037 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[1],[2]	375	375
7.00% notes, due 2040 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[1],[2]	500	500
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.