Summary of Significant Accounting Policies - Other Intangibles (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Intangibles
Weighted Average Amortization Period	11 years 3 months 18 days
Gross	$ 3,543	$ 3,382
Accumulated amortization	(1,586)	(1,573)
Net carrying amount	1,957	1,809
Amortization expense	202	$ 253	$ 237
Estimated amortization expense:
2024	198
2025	193
2026	191
2027	191
2028	$ 190

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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