Income Taxes (Details 3) $ in Millions	Dec. 31, 2018 USD ($)
Operating and capital loss carryforwards [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 3,600
Amount of operating and capital loss carryforwards due to expire in 2016	2
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020	149
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035	1,194
Amount of operating and capital loss carryforwards which may be carried forward indefinitely	346
Total Operating and Capital Loss Carryforwards	1,691
Foreign [Member]
Operating and capital loss carryforwards [Line Items]
Amount of operating and capital loss carryforwards due to expire in 2016	2
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020	22
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035	46
Amount of operating and capital loss carryforwards which may be carried forward indefinitely	346
Total Operating and Capital Loss Carryforwards	416
U.S. state [Member]
Operating and capital loss carryforwards [Line Items]
Amount of operating and capital loss carryforwards due to expire in 2016	0
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020	78
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035	941
Amount of operating and capital loss carryforwards which may be carried forward indefinitely	0
Total Operating and Capital Loss Carryforwards	1,019
Internal Revenue Service (IRS) [Member]
Operating and capital loss carryforwards [Line Items]
Amount of operating and capital loss carryforwards due to expire in 2016	0
Amount of operating and capital loss carryforwards due to expire between 2017 and 2020	49
Amount of operating and capital loss carryforwards due to expire between 2021 and 2035	207
Amount of operating and capital loss carryforwards which may be carried forward indefinitely	0
Total Operating and Capital Loss Carryforwards	$ 256