Fair Value Measurements (Details 4) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013		Jun. 30, 2013	Dec. 31, 2012
Financial assets:
Cash and cash equivalents	$ 2,116		$ 1,639		$ 1,271	$ 1,705
Mortgage loans	920		781
Policy loans	233		238
Financial liabilities:
Long-term debt	912		913
Level 1 [Member]
Financial assets:
Cash and cash equivalents	2,116		1,639
Mortgage loans	0		0
Policy loans	0		0
Total financial assets not accounted for at fair value	2,116		1,639
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	961		909
Total financial liabilities not accounted for at fair value	961		909
Level 3 [Member]
Financial assets:
Cash and cash equivalents	0		0
Mortgage loans	917		779
Policy loans	233		238
Total financial assets not accounted for at fair value	1,150		1,017
Financial liabilities:
Annuity benefits accumulated	21,888	[1]	19,959	[1]
Long-term debt	75		76
Total financial liabilities not accounted for at fair value	21,963		20,035
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	2,116		1,639
Mortgage loans	920		781
Policy loans	233		238
Total financial assets not accounted for at fair value	3,269		2,658
Financial liabilities:
Annuity benefits accumulated	22,314	[1]	20,741	[1]
Long-term debt	912		913
Total financial liabilities not accounted for at fair value	23,226		21,654
Fair Value [Member]
Financial assets:
Cash and cash equivalents	2,116		1,639
Mortgage loans	917		779
Policy loans	233		238
Total financial assets not accounted for at fair value	3,266		2,656
Financial liabilities:
Annuity benefits accumulated	21,888	[1]	19,959	[1]
Long-term debt	1,036		985
Total financial liabilities not accounted for at fair value	$ 22,924		$ 20,944

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