Fair Value Measurements (Details 5) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Financial assets:
Cash and cash equivalents	$ 1,639		$ 1,705		$ 1,324	$ 1,099
Mortgage loans	781		607
Policy loans	238		228
Financial liabilities:
Long-term debt	913		953
Level 1 [Member]
Financial assets:
Cash and cash equivalents	1,639		1,705
Mortgage loans	0		0
Policy loans	0		0
Total financial assets not accounted for at fair value	1,639		1,705
Financial liabilities:
Annuity benefits accumulated	0	[1]	0	[1]
Long-term debt	0		0
Total financial liabilities not accounted for at fair value	0		0
Level 2 [Member]
Financial assets:
Cash and cash equivalents	0		0
Mortgage loans	0		0
Policy loans	0		0
Total financial assets not accounted for at fair value	0		0
Financial liabilities:
Annuity benefits accumulated	0	[1]	0	[1]
Long-term debt	909		990
Total financial liabilities not accounted for at fair value	909		990
Level 3 [Member]
Financial assets:
Cash and cash equivalents	0		0
Mortgage loans	779		613
Policy loans	238		228
Total financial assets not accounted for at fair value	1,017		841
Financial liabilities:
Annuity benefits accumulated	19,959	[1]	17,558	[1]
Long-term debt	76		96
Total financial liabilities not accounted for at fair value	20,035		17,654
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	1,639		1,705
Mortgage loans	781		607
Policy loans	238		228
Total financial assets not accounted for at fair value	2,658		2,540
Financial liabilities:
Annuity benefits accumulated	20,741	[1]	17,405	[1]
Long-term debt	913		953
Total financial liabilities not accounted for at fair value	21,654		18,358
Fair Value [Member]
Financial assets:
Cash and cash equivalents	1,639		1,705
Mortgage loans	779		613
Policy loans	238		228
Total financial assets not accounted for at fair value	2,656		2,546
Financial liabilities:
Annuity benefits accumulated	19,959	[1]	17,558	[1]
Long-term debt	985		1,086
Total financial liabilities not accounted for at fair value	$ 20,944		$ 18,644

[1] Excludes life contingent annuities in the payout phase.