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Supplemental Cash Flow Information - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities | $ 106 | $ 326 | $ 131
Liabilities assumed | 90 | 34 |
Non-cash financing activities related to the issuance of shares for vested restricted stock units | 43 | 41 | 74
Liabilities for collateral received reported in other liabilities and accrued expenses | 1,120 | 1,120 | 829
Obligations to return cash collateral for over-the-counter (OTC) and cleared derivatives reported in other liabilities and accrued expenses or other investments | $ 3 | 5 | $ 11
Limited Partnership |  |  |
Debt Instrument [Line Items] |  |  |
Liabilities assumed |  | $ 89 |

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