Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Millions		Dec. 31, 2020		Dec. 31, 2019
Allowance for Credit Losses		$ 38
Available for sale, fixed maturity securities, amortized cost		91,630		$ 79,371
Allowance for Credit Losses		10
Held to maturity, fixed maturity securities, fair value		30,399		37,594
Loans and Leases Receivable, Allowance		180		45	[1]
Commercial mortgage and other loans		10,554		9,569
Other investments		$ 2,429		$ 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)		1,351,018		1,349,309
Consolidated Entity Excluding Variable Interest Entities (VIE)
Allowance for Credit Losses		$ 38
Available for sale, fixed maturity securities, amortized cost		88,143		$ 76,063
Variable Interest Entity, Consolidated
Available for sale, fixed maturity securities, amortized cost		3,487	[2]	3,308
Commercial mortgage and other loans		8,964	[2]	7,956
Other investments	[3]	$ 826	[2]	$ 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[1] U.S. GAAP guidance adopted as of January 1, 2020 has superseded these losses, included for comparative purposes only.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