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Insurance - Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Analysis of changes in the liability for losses and loss adjustment expenses, net of reinsurance                      
Balance at beginning of period       $ 8,563       $ 8,127 $ 8,563 $ 8,127 $ 7,872
Less reinsurance recoverables, net of allowance       2,302       2,201 2,302 2,201 2,227
Net liability at beginning of period       6,261       5,926 6,261 5,926 5,645
Liability for losses and loss adjustment expenses, period increase (decrease) [Abstract]                      
Provision for losses and LAE occurring in the current year                 3,019 2,730 2,662
Net increase (decrease) in the provision for claims of prior years:                      
Provision for claims of prior years related to special A&E charges, Neon exited lines development and other $ (66) $ 52 $ (22) $ (28) $ 10 $ 22 $ 28 $ (28) (64) 32  
Total losses and LAE incurred                 2,955 2,762 2,695
Payments for losses and LAE of:                      
Current year                 (942) (841) (828)
Prior years                 (1,586) (1,512) (1,575)
Total payments                 (2,528) (2,353) (2,403)
Reserves of businesses acquired                 0 (40) [1] 0
Foreign currency translation and other                 33 (34) (11)
Net liability at end of period 6,721       6,261       6,721 6,261 5,926
Add back reinsurance recoverables, net of allowance 2,957       2,302       2,957 2,302 2,201
Gross unpaid losses and LAE included in the balance sheet $ 9,678       $ 8,563       9,678 8,563 8,127
Special A&E charges                      
Net increase (decrease) in the provision for claims of prior years:                      
Provision for claims of prior years related to special A&E charges, Neon exited lines development and other                 89 36 67
Neon exited lines charge                      
Net increase (decrease) in the provision for claims of prior years:                      
Provision for claims of prior years related to special A&E charges, Neon exited lines development and other                 (18) 57 0
Other                      
Net increase (decrease) in the provision for claims of prior years:                      
Provision for claims of prior years related to special A&E charges, Neon exited lines development and other                 $ (135) $ (61) $ (34)
[1] Reflects the 2016 reinsurance to close transactions at Neon (discussed below).