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Operating Segments - Geographic Data (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Geographic Data |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 5,952 | $ 5,170 | $ 4,950 | $ 4,111 | $ 4,996 | $ 5,551 | $ 6,663 | $ 5,942 | $ 20,182 | $ 23,152 | $ 43,464
Long-lived assets | 19,936 |  |  |  | 19,310 |  |  |  | 19,936 | 19,310 |
United States |  |  |  |  |  |  |  |  |  |  |
Geographic Data |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 15,599 | 18,701 | 34,860
Long-lived assets | 16,041 |  |  |  | 15,942 |  |  |  | 16,041 | 15,942 |
Canada |  |  |  |  |  |  |  |  |  |  |
Geographic Data |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 4,583 | 4,451 | $ 8,604
Long-lived assets | $ 3,895 |  |  |  | $ 3,368 |  |  |  | $ 3,895 | $ 3,368 |

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