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Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of quarterly results of operations |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 4,664 | $ 4,697 | $ 4,883 | $ 4,646 | $ 4,949 | $ 5,031 | $ 4,999 | $ 4,904 | $ 18,890 | $ 19,883 | $ 17,782
Margin | 664 | 566 | 673 | 615 | 446 | 564 | 254 | 546 | 2,518 | 1,810 | 1,725
Gain (loss) on sales of subsidiaries | (52) | 37 | 0 | 0 |  |  |  |  | (15) | 0 | 0
Impairment losses |  |  |  |  | 269 | 129 | 72 | 0 | 0 | 470 | 0
Restructuring and separation costs | 8 | 5 | 8 | 25 | 73 | 118 | 43 | 0 | 46 | 234 | 0
Net income (loss) | $ 201 | $ 197 | $ 202 | $ 107 | $ (262) | $ (97) | $ (230) | $ 77 | $ 707 | $ (512) | $ 52
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 3.24 | $ 3.22 | $ 3.29 | $ 1.79 | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.38 | $ 11.57 | $ (9.07) | $ 0.93
Diluted (in dollars per share) | $ 3.01 | $ 2.90 | $ 3.02 | $ 1.64 | $ (4.59) | $ (1.70) | $ (4.10) | $ 1.37 | $ 10.61 | $ (9.07) | $ 0.92

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