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Supplemental Cash Flow Information - Activities resulting from management of proceeds (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Net change in proceeds managed |  |
Net change in fixed income securities | $ 80 | $ 122
Net change in short-term investments | (493) | (663)
Operating cash flow used | (413) | (541)
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (1,458) | (1,124)
Liabilities for collateral, end of period | (1,871) | (1,665)
Operating cash flow provided | $ 413 | $ 541

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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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