Implementation of ASU No. 2016-2 (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets, net	$ 336		$ 0
Operating lease, liability	$ 340
Lease Revenue (ASC 842)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets, net		$ 351
Operating lease, liability		358
Lease Revenue (ASC 842) | Discontinued Operations, Held-for-sale or Disposed of by Sale
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease assets, net		19
Operating lease, liability		$ 21