Retirement Plans - Changes in Accumulated Other Comprehensive Income Before Tax (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Roll Forward]
Held for sale	$ 0	$ 0
Add back Held for sale	0	(2)
Effect of plan combinations	0	11
Amortization of actuarial loss	(1)	(1)
Pension Plans, Defined Benefit
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Roll Forward]
Total retirement benefit recognized in accumulated other comprehensive income at beginning of year	15	13
Net actuarial gain	(7)	(8)
Amortization of actuarial loss	(1)	(1)	$ (1)
Translation difference	0	2
Total retirement benefit recognized in accumulated other comprehensive income at end of year	$ 7	$ 15	$ 13

Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for transition asset (obligation) of defined benefit plan.

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Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Roll Forward]

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Other Comprehensive Income (Loss), Defined Benefit Plan, Translation Difference, before Tax

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