Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions		Mar. 31, 2020		Dec. 31, 2019
Available for sale, fixed maturity securities, amortized cost		$ 87,881		$ 79,371
Available for sale, fixed maturity securities, allowance for credit losses		63
Held to maturity, fixed maturity securities, fair value		29,347		37,594
Held-to-maturity, fixed maturity securities, allowance for credit losses		9
Commercial mortgage and other loans		10,750		9,569
Commercial mortgage and other loans, allowance for credit losses		125		45	[1]
Other investments		$ 1,843		$ 1,477
Common stock, par value (in dollars per share)		$ 0.10		$ 0.10
Common stock, shares authorized (in shares)		1,900,000		1,900,000
Common stock, shares issued (in shares)		1,350,650		1,349,309
Consolidated Entity Excluding Variable Interest Entities (VIE)
Available for sale, fixed maturity securities, amortized cost		$ 84,673		$ 76,063
Available for sale, fixed maturity securities, allowance for credit losses		63
Variable Interest Entity, Consolidated
Available for sale, fixed maturity securities, amortized cost		3,208	[2]	3,308
Commercial mortgage and other loans		9,051		7,956
Other investments	[3]	$ 550		$ 494

[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.

[2] Net of allowance for credit losses

[3] Consists entirely of alternative investments in limited partnerships