Short-Term and Long-Term Debt (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Total long-term debt		$ 5,345	$ 5,553
Long-term Debt [Member]
Senior Long Term Notes		3,910	4,110
Capital Securities		1,213	1,213
Unamortized premiums (discounts)		(9)	(12)
Unamortized debt issuance costs		(27)	(29)
Fair value hedge - interest rate swap agreements		258	271
Total unamortized premiums (discounts), unamortized debt issuance costs and fair value hedges on interest rate swap agreements		222	230
Total long-term debt		5,345	5,553
Parent Company [Member]
Total long-term debt		5,343	5,302
LIBOR plus 3 bps notes, due 2017 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[1]		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]	287	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	300
3.63% notes, due 2026 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	400
6.15% notes, due 2036 [Member] | Long-term Debt [Member]
Senior Long Term Notes	[2]	348	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.