Derivative Instruments - Schedule of Pre-Tax Income (Loss) Effects of Cash Flow Hedges (Details) - Cash flow hedges - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	$ 29	$ 95
Gain (loss) reclassified into net income (loss) from OCI	46	49
Gain (loss) recognized in net income (loss)	0	0
Interest rate swaps hedging assets \| Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	35	62
Gain (loss) reclassified into net income (loss) from OCI	44	48
Interest rate swaps hedging assets \| Net investment (gains) losses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	0	0
Gain (loss) reclassified into net income (loss) from OCI	3	1
Gain (loss) recognized in net income (loss)	0	0
Interest rate swaps hedging liabilities \| Net investment (gains) losses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in net income (loss)	0	0
Interest rate swaps hedging liabilities \| Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	(1)	(2)
Gain (loss) reclassified into net income (loss) from OCI	(1)	0
Foreign currency swaps \| Net investment income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	5	(1)
Gain (loss) reclassified into net income (loss) from OCI	0	0
Foreign currency swaps \| Net investment (gains) losses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in net income (loss)	0	0
Forward bond purchase commitments \| Net investment (gains) losses
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (loss) recognized in OCI	(10)	36
Gain (loss) reclassified into net income (loss) from OCI	0	0
Gain (loss) recognized in net income (loss)	$ 0	$ 0