Income Taxes Loss Carryforwards (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items]
Undistributed Earnings of Foreign Subsidiaries	$ 13,210
Federal and State [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2018
Federal and State [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 195
State [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	1,860
Non- U.S. [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	4,090
Portion of Non- U.S. with expiration dates [Member]
Operating Loss Carryforwards [Line Items]
Net Operating Loss Carryforwards	$ 1,430
Portion of Non- U.S. with expiration dates [Member] | Minimum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2018
Portion of Non- U.S. with expiration dates [Member] | Maximum [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Expiration Date	Dec. 31, 2037