Condensed Consolidated Balance Sheets - USD ($) $ in Millions		Mar. 31, 2021	Dec. 31, 2020
Fixed maturity securities:
Bonds available for sale, at fair value, net of allowance for credit losses of $122 in 2021 and $186 in 2020 (amortized cost: 2021 - $247,438; 2020 - $244,337)	[1]	$ 263,012	$ 271,496
Other bond securities, at fair value (See Note 5)	[1]	4,973	5,291
Equity Securities, at fair value (See Note 5)	[1]	1,160	1,056
Mortgage and other loans receivable, net of allowance for credit losses of $787 in 2021 and $814 in 2020	[1]	45,468	45,562
Other invested assets (portion measured at fair value: 2021 - $8.713; 2020 - $8,422)	[1]	19,390	19,060
Short-term investments, including restricted cash of $210 in 2021 and $180 in 2020 (portion measured at fair value: 2021 - $4,426; 2020 - $5,968)	[1]	14,454	18,203
Total investments		348,457	360,668
Cash	[1]	2,796	2,827
Accrued investment income	[1]	2,309	2,271
Premiums and other receivables, net of allowance for credit losses and disputes of $203 in 2021 and $205 in 2020		13,808	11,333
Reinsurance assets, net of allowance for credit losses and disputes		41,932	38,963
Deferred income taxes		13,690	12,624
Deferred policy acquisition costs		11,144	9,805
Other assets, net of allowance for credit losses of $49 in 2021 and $49 in 2020, including restricted cash of $238 in 2021 and $223 in 2020 (portion measured at fair value: 2021 - $1,006; 2020 - $887)	[1]	13,223	13,122
Separate account assets, at fair value		102,689	100,290
Total assets		584,390	586,481
Liabilities:
Liability for unpaid losses and loss adjustment expenses, including allowance for credit losses of $14 in 2021 and $14 in 2020		78,832	77,720
Unearned premiums		21,012	18,660
Future policy benefits for life and accident and health insurance contracts		50,709	51,097
Policyholder contract deposits (portion measured at fair value: 2021 - $7.617; 2020 - $9,798)		157,741	160,251
Other policyholder funds		3,564	3,548
Fortitude Re funds withheld payable (portion measured at fair value: 2021 - $3,487; 2020 - $6,042)		40,181	43,060
Other liabilities (portion measured at fair value: 2021 - $703; 2020 - $570)	[1]	30,454	27,122
Long-term debt (portion measured at fair value: 2021 - $2,015; 2020 - $2,097)	[1]	26,432	28,103
Separate account liabilities		102,689	100,290
Total liabilities		520,830	519,282
Contingencies, commitments and guarantees (see Note 11)
AIG shareholders' equity:
Series A non-cumulative preferred stock and additional paid in capital, $5.00 par value; 100,000,000 shares authorized; shares issued: 2021 - 20,000 and 2020 - 20,000; liquidation preference $500		485	485
Common stock, $2.50 par value; 5,000,000,000 shares authorized; shares issued: 2021 - 1,906,671,492 and 2020 - 1,906,671,492		4,766	4,766
Treasury stock, at cost; 2021 - 1,047,288,039 shares; 2020 - 1,045,113,443 shares of common stock		(49,412)	(49,322)
Additional paid-in capital		81,253	81,418
Retained earnings		19,121	15,504
Accumulated other comprehensive income		6,466	13,511
Total AIG shareholders' equity		62,679	66,362
Non-redeemable noncontrolling interests		881	837
Total equity		63,560	67,199
Total liabilities and equity		584,390	586,481
Fortitude
Fixed maturity securities:
Reinsurance assets, net of allowance for credit losses and disputes		34,342	34,578
Debt of consolidated investments
Liabilities:
Long-term debt (portion measured at fair value: 2021 - $2,015; 2020 - $2,097)	[1]	$ 9,216	$ 9,431

[1] See Note 8 for details of balances associated with variable interest entities.