Financial Instruments - Net Investment Hedge Derivative Contracts (Details) - Net Investment Hedging - Net investment hedge contracts - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
After-tax gain/(loss) on NIH contracts	[1]	$ (6)		$ 191	$ 0
Amounts excluded from the assessment of hedge effectiveness(1)		$ 133	[2]	$ 120	$ 0

[1] Amounts recorded for unsettled and settled NIH derivative contracts are recorded in the cumulative translation adjustment within other comprehensive earnings. The cash flows from the settled contracts are reported within other investing activities in the consolidated statement of cash flows.

[2] We elected to record changes in the fair value of amounts excluded from the assessment of effectiveness in net earnings within interest and other expense, net.