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Quarterly Operating Results (Unaudited) - Quarterly results of consolidated operations (Details) - USD ($)
$ / shares in Units, shares in Millions, $ 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
Condensed Statement of Earnings                      
Revenues $ 1,808 $ 1,835 $ 1,646 $ 1,576 $ 1,737 $ 1,705 $ 1,581 $ 1,475 $ 6,865 $ 6,498 $ 6,145
Net earnings, including noncontrolling interests 166 11 145 155 388 113 63 104 477 668 370
Net earnings attributable to shareholders $ 166 $ 11 $ 145 $ 153 $ 385 $ 109 $ 54 $ 101 $ 475 $ 649 $ 352
Earnings Attributable to Shareholders per Common Share:                      
Basic (USD per share) $ 1.88 $ 0.13 $ 1.64 $ 1.76 $ 4.43 $ 1.25 $ 0.63 $ 1.16 $ 5.40 $ 7.47 $ 4.02
Diluted (USD per share) $ 1.84 $ 0.13 $ 1.61 $ 1.72 $ 4.33 $ 1.23 $ 0.62 $ 1.14 $ 5.28 $ 7.33 $ 3.94
Average number of Common Shares:                      
Basic (shares) 88.2 88.1 87.8 87.2 86.9 86.9 86.8 86.9 87.8 86.9 87.6
Diluted (shares) 90.1 90.0 89.8 89.3 88.8 88.5 88.4 88.5 89.8 88.5 89.4