Shareholders' Equity - Accelerated Share Repurchases (Details) - 2021 ASR - Subsequent Event - Barclays Bank $ / shares in Units, shares in Millions, $ in Billions	Jan. 04, 2022 USD ($) $ / shares shares
Equity, Class of Treasury Stock [Line Items]
ASR agreement, amount | $	$ 1.5
Payments for ASR, amount | $	$ 1.5
ASR percent of notional amount received in shares	80.00%
ASR, maximum amount of shares received or delivered | shares	29.0
Shares repurchased (in shares) | shares	11.6
Share price (in dollars per share) | $ / shares	$ 103.34
ASR, shares to be received at the end of program as a percent of notional amount	20.00%