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Basis of Financial Statements - Recent Developments (Details) - USD ($) $ / shares in Units, shares in Thousands			1 Months Ended		9 Months Ended
	Sep. 17, 2021	Aug. 03, 2021	Oct. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Jun. 29, 2021	Mar. 30, 2021	Jan. 25, 2021	Dec. 31, 2020	Dec. 07, 2020
Business Acquisition [Line Items]
Stock repurchase program, period		3 years
Stock repurchase program, number of shares authorized to be repurchased		25,000
Subscriber fee, percentage						2.50%
Funding agreement backed note, maximum authorized amount				$ 5,000,000,000.0
Funding agreement backed note, amount outstanding					$ 1,900,000,000
Pension obligations					3,985,000,000				$ 4,010,000,000
Subsequent Event
Business Acquisition [Line Items]
Pension risk transfer, pension obligations			$ 564,000,000
Pension Risk Transfer
Business Acquisition [Line Items]
Pension risk transfer, pension obligations					$ 371,000,000
FTAC Subscription Agreements
Business Acquisition [Line Items]
Subscription agreements, investment								$ 150,000,000
Subscription agreements, stock purchase, par value (in usd per share)								$ 0.001
Subscription agreements, stock purchase, share price (in usd per share)								$ 10.00
Paysafe Limited | Subscription Agreements with Paysafe Limited and Foley Trasimene Acquisition Corp. II
Business Acquisition [Line Items]
Subscription agreements, investment										$ 500,000,000
Subscription agreements, stock purchase, par value (in usd per share)										$ 0.001
Subscription agreements, stock purchase, share price (in usd per share)										$ 10.00
Subscriber fee, percentage										1.60%
Subscriptions funded, shares received (in shares)							50,000
Subscription agreements, ownership interest after purchase, percent					7.00%
3.20% Notes
Business Acquisition [Line Items]
Debt instrument, interest rate, stated percentage	3.20%				3.20%
Aggregate principal amount	$ 450,000,000
Proceeds from issuance of senior notes	$ 443,000,000

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