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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Right of Use Assets
Right-of-Use Asset, Operating Leases	$ 1,095		$ 1,095		$ 1,168
Right-of-Use Asset, Finance Leases	21		21		22
Operating Lease Liabilities, Payments Due
Total lease liabilities, Operating Leases	$ 1,471		$ 1,471		$ 1,600
Weighted Average Remaining Lease Term, Operating Leases	6 years 4 months 24 days		6 years 4 months 24 days		6 years 7 months 6 days
Weighted Average Discount Rate, Percent, Operating Leases	2.40%		2.40%		2.30%
Operating Lease, Cost	$ 75	$ 85	$ 160	$ 170
Finance Lease Liabilities, Payments, Due
Total lease liabilities, Finance Leases	$ 25		$ 25		$ 26
Weighted Average Remaining Lease Term, Finance Leases	6 years		6 years		6 years 4 months 24 days
Weighted Average Discount Rate, Percent, Finance Leases	3.40%		3.40%		3.50%