Derivative Instruments - Summary of Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Derivative [Line Items]
Derivatives assets designated as cash flow hedges and net investment hedges	$ 29	$ 65
Derivatives liabilities designated as cash flow hedges and net investment hedges	343	179
Derivatives designated as cash flow hedges | Interest rate | Other assets, net
Derivative [Line Items]
Derivatives assets designated as cash flow hedges and net investment hedges	7	0
Derivatives designated as cash flow hedges | Interest rate | Other liabilities, net
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges and net investment hedges	175	72
Derivatives designated as cash flow hedges | Foreign currency | Prepaids and other current assets
Derivative [Line Items]
Derivatives assets designated as cash flow hedges and net investment hedges	0	7
Derivatives designated as cash flow hedges | Foreign currency | Other accrued liabilities
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges and net investment hedges	2	0
Derivatives designated as net investment hedges | Foreign currency | Other assets, net
Derivative [Line Items]
Derivatives assets designated as cash flow hedges and net investment hedges	22	58
Derivatives designated as net investment hedges | Foreign currency | Other liabilities, net
Derivative [Line Items]
Derivatives liabilities designated as cash flow hedges and net investment hedges	$ 166	$ 107