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Business Developments and Risks and Uncertainties (Tables)
6 Months Ended
Jun. 30, 2017
Text Block [Abstract]  
Assets And Liabilities Held For Sale
As of
In millionsDecember 31, 2016
Assets
Investments $466
Cash and cash equivalents73
Premiums receivable 267
Other assets19
Valuation allowance(270)
Total assets held for sale$555
Liabilities
Unearned premium revenue$304
Other liabilities 42
Total liabilities held for sale$346