New Accounting Standards Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Oct. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset	$ 1,091
Operating lease liability	$ 1,112
Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 1,100
Operating lease liability		$ 1,100