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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information [Line Items]                      
Earnings Per Share, Diluted, Gain on Equity Method Investments Impact   $ (0.04)                  
Impairment of Long-Lived Assets Held-for-use                 $ 0 $ 319 $ 0
Revenue from Contract with Customer, Excluding Assessed Tax $ 2,031 $ 2,086 $ 2,105 $ 1,871 $ 1,968 $ 2,008 $ 1,928 $ 1,754 8,094 7,658 7,012
Operating income(1)(2) 227 247 250 76 216 78 (152) 125 800 266 973
Net income (1) $ 161 $ 187 $ 179 $ 42 $ 170 $ 50 $ (121) $ 90 $ 569 $ 189 $ 1,140
Basic earnings per share $ 0.56 $ 0.63 $ 0.60 $ 0.14 $ 0.55 $ 0.16 $ (0.39) $ 0.28 $ 1.92 $ 0.60 $ 3.47
Diluted earnings per share(1)(2) $ 0.56 $ 0.63 $ 0.59 $ 0.14 $ 0.55 $ 0.16 $ (0.39) $ 0.28 $ 1.91 $ 0.60 $ 3.45
Special Items     $ 2 $ 12 $ 4 $ 112 $ 319   $ 14 $ 435 $ 0
Earnings Per Share, Diluted, Special Items Impact     $ (0.01) $ (0.02) $ (0.01) $ (0.27) $ (0.76)        
Tax Cuts and Jobs Act, Income Tax Expense (Benefit)         $ (17) $ (4)   $ (7)   $ (28) $ (564)
Tax Cuts and Jobs Act, Earnings Per Share, Diluted, Pro Forma Adjustment         $ 0.06 $ 0.01   $ 0.02