New Accounting Pronouncements New Accounting Pronouncements - Topic 842 (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Non-Current Assets	$ 519		$ 352
Other Liabilities, Current	600		722
Other Non-Current Liabilities	$ 475		$ 362
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other Non-Current Assets		$ 288
Other Liabilities, Current		92
Other Non-Current Liabilities		$ 219