Fair Value Measurements - Assets measured at fair value on a non-recurring basis and related impairment charges (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets	[1]	$ 15,794		$ 15,794		$ 15,668
Impairment Charges				12	$ 19
Fair value on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets		17		17		104
Other assets		0		0
Total		17		17		104
Impairment Charges		11	$ 13	11	19
Fair value on a non-recurring basis | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		11	0	11	6
Fair value on a non-recurring basis | Asset Class to Loans Held For Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total		170		170
Fair value on a non-recurring basis | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		0	$ 13	0	$ 13
Fair value on a non-recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets		0		0		0
Other assets		0		0
Total		0		0		0
Fair value on a non-recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets		0		0		0
Other assets		0		0
Total		0		0		0
Fair value on a non-recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets		17		17		104
Other assets		0		0
Total		$ 17		$ 17		$ 104

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