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Derivatives and Hedging Instruments - Gain (Loss) on Derivatives (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (1)	$ 0
Unrealized gains (loss) on derivatives	57	0
Interest Rate Contract | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Investments	57	0
Interest Rate Contract | Cash Flow Hedging | Cost of service
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 1	$ 0

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

+ References

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-Publisher FASB
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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of unrealized gain (loss) on investment.

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