Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Jun. 30, 2016		Dec. 31, 2015
Available-for-sale Debt Securities, Amortized Cost Basis		$ 56,722		$ 56,965
Available-for-sale Equity Securities, Amortized Cost Basis		772		1,135
Available-for-sale Securities, Equity Securities		827		1,121
Variable Interest Entity, Consolidated, Carrying Amount, Assets		$ 12		$ 166
Common stock, par value		$ 0.01		$ 0.01
Common stock, shares authorized		1,500,000,000		1,500,000,000
Common stock, shares issued		490,923,222		490,923,222
Treasury stock, shares		103,007,357		89,102,038
Commercial Loan [Member]
Allowance for Loan and Lease Losses, Real Estate		$ 19		$ 23
Fixed Maturities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		0		150
Equity Securities [Member]
Available-for-sale Equity Securities, Amortized Cost Basis				293
Available-for-sale Securities, Equity Securities		0		282
Partnership Interest [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		4		2
Other Liabilities [Member]
Other liabilities, variable interest entity liabilities	[1]	5		12
Other Assets [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		0		0
Short-term Investments [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		3		3
Cash [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		5		10
Equity Securities [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets		0		1
Equity Securities [Member]
Available-for-sale Equity Securities, Amortized Cost Basis		772	[2]	842
Available-for-sale Securities, Equity Securities	[2]	$ 827		$ 839

[1] Included in other liabilities on the Company’s Condensed Consolidated Balance Sheets.

[2] Excluded equity securities, FVO, with a cost and fair value of $293 and $282 as of December 31, 2015. The Company held no equity securities, FVO as of June 30, 2016.