Fair Value Measurements - Assets measured at fair value on a non-recurring basis and related impairment charges (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2023	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets	[1]	$ 16,067	$ 16,067		$ 15,953
Impairment Charges			12	$ 1
Fair value on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets					12
Other assets		12	12
Total(d)		12	12		12
Impairment Charges		8	17	0
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(d)		36	36		163
Fair value on a non-recurring basis | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		8	17	$ 0
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
Other assets		0	0
Total(d)		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
Other assets		0	0
Total(d)		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					12
Other assets		12	12
Total(d)		$ 12	$ 12		$ 12

[1] See Note 10 for details of balances associated with variable interest entities.