Condensed Consolidated Balance Sheet (unaudited) (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Available-for-sale securities, amortized cost	$ 25,772	$ 26,810
Held-to-maturity securities, fair value	$ 4,670	$ 4,293
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,100,000,000	1,100,000,000
Common stock, shares issued (in shares)	518,419,336	515,777,584
Common stock, shares outstanding (in shares)	307,152,469	305,387,550
Treasury stock, common, shares (in shares)	211,266,867	210,390,034