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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets	[1]	$ 16,040		$ 16,040		$ 15,668
Impairment Charges				1	$ 25
Fair value on a non-recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other invested assets		0		0		104
Total		0		0		104
Impairment Charges		0	$ 0	0	6
Fair value on a non-recurring basis | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment Charges		0	$ 0	0	$ 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		109		109
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
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
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		0		0		104
Total		$ 0		$ 0		$ 104

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