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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]              
Charge for U.S. tax reform $ 80     $ 275 $ 80 $ 0  
Tax benefit from foreign court decision   $ 15         $ 30
Accounting Standards Update 2018-02              
Income Tax Contingency [Line Items]              
Tax reform, reclassification from AOCI to retained earnings, tax effect     $ 163