Contingencies and Commitments (Tables)	12 Months Ended
	Dec. 31, 2021
Contingencies And Commitments [Abstract]
Finance Lease Expense	For the Years Ended December 31, 2021 2020 2019 Amortization of finance lease assets (1)$ 38 $ 53 $ 67 Interest on finance lease liabilities (2) 3 6 13 Total $ 41 $ 59 $ 80 (1)Amortization of finance lease assets is reported in commissions and other expenses on our Consolidated Statements of Comprehensive Income (Loss).(2)Interest on finance lease liabilities is reported in interest and debt expense on our Consolidated Statements of Comprehensive Income (Loss).
Cash Flow Information Related To Leases	For the Years Ended December 31, 2021 2020 2019 Supplemental Cash Flow Information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases$ 47 $ 54 $ 56 Financing cash flows from finance leases 62 53 96 Supplemental Non-cash Information ROU assets obtained in exchange for new lease obligations: Operating leases$ 8 $ 10 $ 80
Future Minimum Lease Payments	Operating Finance Leases Leases 2022$ 46 $ 72 2023 43 79 2024 30 17 2025 23 7 2026 21 4 Thereafter 27 - Total future minimum lease payments 190 179 Less: Amount representing interest 33 4 Present value of minimum lease payments$ 157 $ 175
Future Payments on Financing Arrangements	2022$ 8 2023 26 2024 80 2025 114 2026 165 Thereafter 4 Total future minimum lease payments 397 Less: Amount representing interest 22 Present value of minimum lease payments$ 375