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Supplemental Cash Flow Information - Net change (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net change in proceeds managed |  |  |
Net change in fixed income securities | $ 259 | $ (584) | $ 0
Net change in short-term investments | (255) | 295 | (59)
Operating cash flow provided (used) | 4 | (289) | (59)
Net change in cash | 1 | 0 | 1
Net change in proceeds managed | 5 | (289) | (58)
Net change in liabilities |  |  |
Liabilities for collateral, beginning of year | (1,129) | (840) | (782)
Liabilities for collateral, end of year | (1,124) | (1,129) | (840)
Operating cash flow (used) provided | $ (5) | $ 289 | $ 58

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- Definition The net operating cash flow provided by (used in) the net change in liabilities for collateral. + References No definition available. + Details
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- Definition The net operating cash flow provided or used related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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- Definition The net change in cash from the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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- Definition The net change in the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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- Definition The net change in short-term investments from the proceeds managed related to collateral received in conjunction with the entity's securities lending and over-the-counter derivatives. + References No definition available. + Details
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- Definition Net Change in Fixed Income Term Investments of Proceeds Managed Collateral + References No definition available. + Details
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- Definition The liability to return cash and securities received as collateral in conjunction with securities lending and over-the-counter derivatives. + References No definition available. + Details
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