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Condensed Financial Information of Registrant - Condensed Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue: |  |  |  |  |  |  |  |  |  |  |
Investment income and other revenue |  |  |  |  |  |  |  |  | $ 132 | $ 125 | $ 70
Total revenue | $ 4,274 | $ 4,243 | $ 4,193 | $ 4,119 | $ 4,664 | $ 4,697 | $ 4,883 | $ 4,646 | 16,829 | 18,890 | 19,883
Expenses: |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 1,296 | 1,333 | 1,594
Depreciation and amortization |  |  |  |  |  |  |  |  | 89 | 99 | 137
Restructuring costs |  |  |  |  |  |  |  |  | 6 | 46 | 234
Impairment losses |  |  |  |  |  |  |  |  | 0 | 0 | 470
Total operating expenses |  |  |  |  |  |  |  |  | 15,785 | 17,744 | 20,438
Gain (loss) on sales of subsidiaries |  |  |  |  | (52) | 37 | 0 | 0 | 0 | (15) | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 1,044 | 1,131 | (555)
Interest expense |  |  |  |  |  |  |  |  | 87 | 115 | 118
Other (income) expense, net |  |  |  |  |  |  |  |  | (15) | 17 | (61)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 235 | 292 | (100)
Net income (loss) | $ 168 | $ 175 | $ 196 | $ 198 | $ 201 | $ 197 | $ 202 | $ 107 | 737 | 707 | (512)
Parent Company |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Administrative services fees |  |  |  |  |  |  |  |  | 1,038 | 1,138 | 1,317
Investment income and other revenue |  |  |  |  |  |  |  |  | 18 | 17 | 16
Total revenue |  |  |  |  |  |  |  |  | 1,056 | 1,155 | 1,333
Expenses: |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 937 | 1,007 | 1,082
Depreciation and amortization |  |  |  |  |  |  |  |  | 63 | 69 | 93
Other operating expenses |  |  |  |  |  |  |  |  | 0 | 8 | 16
Restructuring costs |  |  |  |  |  |  |  |  | 4 | 35 | 153
Impairment losses |  |  |  |  |  |  |  |  | 0 | 0 | 39
Total operating expenses |  |  |  |  |  |  |  |  | 1,004 | 1,119 | 1,383
Gain (loss) on sales of subsidiaries |  |  |  |  |  |  |  |  | 0 | 37 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 52 | 73 | (50)
Interest expense |  |  |  |  |  |  |  |  | 87 | 114 | 117
Other (income) expense, net |  |  |  |  |  |  |  |  | (15) | 17 | (61)
Loss before income tax (benefit) expense and equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | (20) | (58) | (106)
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 9 | (14) | 8
Net loss before equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | (29) | (44) | (114)
Equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 766 | 751 | (398)
Net income (loss) |  |  |  |  |  |  |  |  | $ 737 | $ 707 | $ (512)

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