Table of Contents Commercial - General Liability Cumulative Net Incurred Claim and Allocated Claim Adjustment Expenses are presented in the following table. As of December 31 Calendar Year As of December 31, 2019 (In millions, except reported claims data) 2010 (1) 2011 (1) 2012 (1) 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 IBNR Cumulative Number of Claims Accident Year 2010 $ 646 $ 664 $ 658 $ 709 $ 750 $ 726 $ 697 $ 691 $ 691 $ 690 $ 19 44,229 2011 591 589 631 677 676 681 670 669 667 20 39,361 2012 587 611 639 636 619 635 635 630 31 35,219 2013 650 655 650 655 613 623 620 27 33,570 2014 653 658 654 631 635 658 57 27,877 2015 581 576 574 589 600 73 23,834 2016 623 659 667 671 166 23,817 2017 632 632 632 226 21,114 2018 653 644 408 17,889 2019 680 602 12,916 Total $ 6,492 $ 1,629 Cumulative Net Paid Claims and Allocated Claim Adjustment Expenses are presented in the following table. As of December 31 Calendar Year (In millions) 2010 (1) 2011 (1) 2012 (1) 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 Accident Year 2010 $ 27 $ 145 $ 280 $ 429 $ 561 $ 611 $ 642 $ 652 $ 656 $ 667 2011 28 148 273 411 517 568 602 622 638 2012 28 132 247 374 454 510 559 579 2013 31 128 240 352 450 510 551 2014 31 119 247 376 481 547 2015 19 110 230 357 446 2016 32 163 279 407 2017 23 118 250 2018 33 107 2019 25 Total $ 4,217 Net liability for unpaid claim and allocated claim adjustment expenses for the accident years presented $ 2,275 Net liability for unpaid claim and claim adjustment expenses for accident years prior to 2010 836 Liability for unallocated claim adjustment expenses for accident years presented 65 Total net liability for unpaid claim and claim adjustment expenses $ 3,176 Net strengthening (releases) of prior accident year reserves is presented in the following table. For the years ended December 31 Calendar Year (In millions) 2011 (1) 2012 (1) 2013 (1) 2014 (1) 2015 (1) 2016 (1) 2017 (1) 2018 (1) 2019 Total Accident Year 2010 $ 18 $ (6) $ 51 $ 41 $ (24) $ (29) $ (6) $ — $ (1) $ 44 2011 (2 ) 42 46 (1 ) 5 (11 ) (1 ) (2 ) 76 2012 24 28 (3) (17) 16 — (5) 43 2013 5 (5 ) 5 (42 ) 10 (3 ) (30 ) 2014 5 (4) (23) 4 23 5 2015 (5 ) (2 ) 15 11 19 2016 36 8 4 48 2017 — — — 2018 (9) (9) Total net development for the accident years presented above (32 ) 36 18 Total net development for accident years prior to 2010 — — 29 Total unallocated claim adjustment expense development 8 (4 ) 7 Total $ (24) $ 32 $ 54 (1) Data presented for these calendar years is required supplemental information, which is unaudited. 97