Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended	16 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense	$ 182	$ 928
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense	16
Undistributed Earnings of Foreign Subsidiaries			$ 4,130
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)	(34)	$ (2,847)
Pension Resize [Member]
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit)	$ (114)