Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Investments excluded from Fair Value Hierarchy, net asset value practical expedient	$ 440	$ 387
Loans Held-for-sale	3,544	4,955
Carrying value of unfunded commitments	260	364
Provision for income taxes	1,556	981	$ 782
Nonperforming
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans Held-for-sale		5
Carrying Amount
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans Held-for-sale	1,200	125
Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items]
Loans Held-for-sale	$ 0	$ 0