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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 |  |  |

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