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Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net change in proceeds managed |  |
Net change in fixed income securities | $ 32 | $ (17)
Net change in short-term investments | 55 | (26)
Operating cash flow provided (used) | 87 | (43)
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (1,124) | (1,129)
Liabilities for collateral, end of period | (1,037) | (1,172)
Operating cash flow (used) provided | $ (87) | $ 43

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- Definition Change in Liabilities for Collateral [Roll Forward] + References No definition available. + Details
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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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- 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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