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Summary of Significant Accounting Policies - Other Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Intangibles
Gross	$ 3,543	$ 3,543
Accumulated amortization	(1,783)	(1,586)
Net carrying amount	1,760	1,957
Amortization expense	197	$ 202	$ 253
Estimated amortization expense:
2025	193
2026	191
2027	191
2028	190
2029	$ 189

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