Other Assets and Liabilites - Schedule of Right of Use Assets and Future Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Right of Use Assets
Right-of-Use Asset, Operating Leases	$ 1,128		$ 1,128		$ 1,193
Right-of-Use Asset, Finance Leases	$ 22		$ 22		$ 20
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets (including $1,715 and $1,582 at fair value, respectively)		Other assets (including $1,715 and $1,582 at fair value, respectively)		Other assets (including $1,715 and $1,582 at fair value, respectively)
Operating Lease Liabilities, Payments Due
Total lease liabilities	$ 1,460		$ 1,460		$ 1,545
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities		Other Liabilities		Other Liabilities
Weighted Average Remaining Lease Term, Operating Leases	6 years 3 months 18 days		6 years 3 months 18 days		6 years 7 months 6 days
Weighted Average Discount Rate, Percent, Operating Leases	2.90%		2.90%		2.70%
Operating Lease, Cost	$ 74	$ 75	$ 156	$ 160
Finance Lease Liabilities, Payments, Due
Total lease liabilities	$ 25		$ 25		$ 23
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other Liabilities		Other Liabilities		Other Liabilities
Weighted Average Remaining Lease Term, Finance Leases	5 years 9 months 18 days		5 years 9 months 18 days		5 years 7 months 6 days
Weighted Average Discount Rate, Percent, Finance Leases	3.60%		3.60%		3.40%