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Quarterly Results of Operations (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary of quarterly results of operations                      
Total revenue $ 4,664 $ 4,697 $ 4,883 $ 4,646 $ 4,949 $ 5,031 $ 4,999 $ 4,904 $ 18,890 $ 19,883 $ 17,782
Margin 664 566 673 615 446 564 254 546 2,518 1,810 1,725
Gain (loss) on sales of subsidiaries (52) 37 0 0         (15) 0 0
Impairment losses         269 129 72 0 0 470 0
Restructuring and separation costs 8 5 8 25 73 118 43 0 46 234 0
Net income (loss) $ 201 $ 197 $ 202 $ 107 $ (262) $ (97) $ (230) $ 77 $ 707 $ (512) $ 52
Net income (loss) per share:                      
Basic (in dollars per share) $ 3.24 $ 3.22 $ 3.29 $ 1.79 $ (4.59) $ (1.70) $ (4.10) $ 1.38 $ 11.57 $ (9.07) $ 0.93
Diluted (in dollars per share) $ 3.01 $ 2.90 $ 3.02 $ 1.64 $ (4.59) $ (1.70) $ (4.10) $ 1.37 $ 10.61 $ (9.07) $ 0.92