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Supplemental Cash Flow Information (Details) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Supplemental Cash Flow Information [Abstract] |  |
Non-cash modifications of certain mortgage loans, fixed income securities, limited partnership interests and other investments, as well as mergers completed with equity securities | $ 9 | $ 270
Non-cash financing activities related to the issuance of shares for vested restricted stock units | 42 | 39
Debt acquired |  | 34
Net change in proceeds managed |  |
Net change in fixed income securities | 10 | 0
Net change in short-term investments | (7) | (56)
Operating cash flow provided (used) | 3 | (56)
Change in Liabilities for Collateral [Roll Forward] |  |
Liabilities for collateral, beginning of period | (1,129) | (840)
Liabilities for collateral, end of period | (1,126) | (896)
Operating cash flow (used) provided | $ (3) | $ 56

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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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- Definition The fair value of liabilities assumed in noncash investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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