Equity - Rollforward of Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	$ 58,103	$ 63,560	$ 68,912	$ 67,199
Change in unrealized appreciation (depreciation) of investments	(17,904)	5,846	(38,071)	(5,803)
Change in deferred policy acquisition costs adjustment and other	2,521	(693)	5,336	698
Change in future policy benefits	942	(378)	2,125	767
Change in foreign currency translation adjustments	(204)	25	(205)	195
Change in net actuarial loss	5	12	16	11
Change in prior service cost	4	2	5	4
Change in deferred tax asset (liability)	1,873	(1,072)	4,383	826
Change in fair value of liabilities under fair value option attributable to changes in own credit risk	(4)	0	(4)	(1)
Other comprehensive income (loss)	(12,767)	3,742	(26,415)	(3,303)
Balance, end of period	46,824	66,908	46,824	66,908
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(5,900)	6,466	6,687	13,511
Other comprehensive income (loss)	(11,756)	3,743	(24,343)	(3,302)
Balance, end of period	(17,656)	10,209	(17,656)	10,209
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(97)	(62)	(57)	(95)
Balance, end of period	(61)	(58)	(61)	(58)
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(2,437)	9,894	10,094	17,093
Balance, end of period	(13,972)	13,605	(13,972)	13,605
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(2,478)	(2,142)	(2,453)	(2,267)
Balance, end of period	(2,747)	(2,128)	(2,747)	(2,128)
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	(894)	(1,231)	(903)	(1,228)
Balance, end of period	(878)	(1,217)	(878)	(1,217)
Fair Value of Liabilities Under Fair Value Option Attributable to Changes in Own Credit Risk
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance, beginning of period	6	7	6	8
Balance, end of period	2	7	2	7
Noncontrolling interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	(1,011)	(1)	(2,072)	(1)
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	4	0	(1)	0
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	(1,003)	(1)	(2,079)	(1)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	(12)	0	8	0
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	0	0	0	0
Fair Value of Liabilities Under Fair Value Option Attributable to Changes in Own Credit Risk
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Noncontrolling interests	0	0	0	0
Unrealized Appreciation (Depreciation) of Fixed Maturity Securities on Which Allowance for Credit Losses Was Taken
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in unrealized appreciation (depreciation) of investments	45	10	(12)	51
Change in deferred policy acquisition costs adjustment and other	4	(2)	4	(4)
Change in deferred tax asset (liability)	(9)	(4)	3	(10)
Other comprehensive income (loss)	40	4	(5)	37
Unrealized Appreciation (Depreciation) of All Other Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in unrealized appreciation (depreciation) of investments	(17,949)	5,836	(38,059)	(5,854)
Change in deferred policy acquisition costs adjustment and other	2,517	(691)	5,332	702
Change in future policy benefits	942	(378)	2,125	767
Change in deferred tax asset (liability)	1,952	(1,057)	4,457	896
Other comprehensive income (loss)	(12,538)	3,710	(26,145)	(3,489)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in foreign currency translation adjustments	(204)	25	(205)	195
Change in deferred tax asset (liability)	(77)	(11)	(81)	(56)
Other comprehensive income (loss)	(281)	14	(286)	139
Retirement Plan Liabilities Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in net actuarial loss	5	12	16	11
Change in prior service cost	4	2	5	4
Change in deferred tax asset (liability)	7	0	4	(4)
Other comprehensive income (loss)	16	14	25	11
Fair Value of Liabilities Under Fair Value Option Attributable to Changes in Own Credit Risk
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Change in fair value of liabilities under fair value option attributable to changes in own credit risk	(4)	0	(4)	(1)
Other comprehensive income (loss)	$ (4)	$ 0	$ (4)	$ (1)