Derivative Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivative assets
Gross amount recognized	$ 7,529	$ 5,298
Financial instruments	(1,739)	(1,497)
Collateral (received)/pledged	(5,272)	(3,676)
Net amount	518	125
Off-balance sheet securities collateral	0	0
Net amount after securities collateral	518	125
Derivative liabilities
Gross amount recognized	(2,758)	(1,995)
Financial instruments	1,739	1,497
Collateral (received)/pledged	1,091	848
Net amount	72	350
Off-balance sheet securities collateral	1	0
Net amount after securities collateral	73	350
Derivatives designated as hedges
Derivative assets
Gross amount recognized	885	781
Derivative liabilities
Gross amount recognized	(842)	(954)
Foreign currency forwards | Derivatives designated as hedges
Derivative assets
Gross amount recognized	195	275
Derivative liabilities
Gross amount recognized	(36)	(102)
Foreign currency swaps | Derivatives designated as hedges
Derivative assets
Gross amount recognized	503	477
Derivative liabilities
Gross amount recognized	(345)	(230)
Cross Currency Interest Rate Contract | Derivatives designated as hedges
Derivative assets
Gross amount recognized	56	0
Derivative liabilities
Gross amount recognized	(418)	(521)
Interest rate swaps | Derivatives designated as hedges
Derivative assets
Gross amount recognized	131	29
Derivative liabilities
Gross amount recognized	(40)	(95)
Fixed maturity securities | Foreign currency forwards | Fair Value Hedging | Derivatives designated as hedges
Derivative [Line Items]
Derivative, Amount of Hedged Item	3,851	4,883
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	(13)	(15)
Fixed maturity securities | Foreign currency swaps | Fair Value Hedging | Derivatives designated as hedges
Derivative [Line Items]
Derivative, Amount of Hedged Item	11,588	6,820
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	71	(141)
Interest Sensitive Contracts | Foreign currency swaps | Fair Value Hedging | Derivatives designated as hedges
Derivative [Line Items]
Derivative, Amount of Hedged Item	2,507	1,438
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	(44)	19
Interest Sensitive Contracts | Cross Currency Interest Rate Contract | Fair Value Hedging | Derivatives designated as hedges
Derivative [Line Items]
Derivative, Amount of Hedged Item	4,220	4,010
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	205	363
Interest Sensitive Contracts | Interest rate swaps | Fair Value Hedging | Derivatives designated as hedges
Derivative [Line Items]
Derivative, Amount of Hedged Item	17,483	6,910
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease)	$ (121)	$ 189