Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions		Jun. 30, 2018		Dec. 31, 2017
Available for sale, fixed maturity securities, amortized cost		$ 78,935	[1],[2]	$ 75,132	[3]
Held to maturity, fixed maturity securities, fair value		$ 37,956		$ 38,072
Common stock, par value (in dollars per share)		$ 0.1		$ 0.1
Common stock, shares authorized (in shares)		1,900,000,000		1,900,000,000
Common stock, shares issued (in shares)		1,347,061,000		1,345,762,000
Asset derivatives		$ 457		$ 331
Liability derivatives		367		474
Variable Interest Entity, Consolidated
Available for sale, fixed maturity securities, amortized cost	[4],[5]	4,492		4,538
Asset derivatives	[6]	202		151
Liability derivatives	[6]	92		128
Consolidated Entity Excluding Variable Interest Entities (VIE)
Available for sale, fixed maturity securities, amortized cost	[5]	74,443		70,594
Held to maturity, fixed maturity securities, fair value		37,956		38,072
Loan Receivables and Limited Partnerships | Variable Interest Entity, Consolidated
Other investments held in unit trust, net of reserves, amortized cost		$ 4,586		$ 2,341

[1] Includes perpetual securities ($1,446 at amortized cost and $1,612 at fair value)

[2] Includes perpetual securities, categorized in accordance with their respective economic maturities (the expected maturity date created by the combination of features in the financial instrument)

[3] Includes perpetual securities ($1,462 at amortized cost and $1,789 at fair value)

[4] Includes perpetual securities

[5] Includes perpetual securities, see Notes 1 and 3 of the Notes to the Consolidated Financial Statements

[6] Consists entirely of derivatives