Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions	4 Months Ended	12 Months Ended	16 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit	$ 2,813	$ 34	$ 2,847
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense	$ 746	182	$ 928
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense		16
Undistributed Earnings of Foreign Subsidiaries				$ 4,614
Pension Resize [Member]
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit		$ 114