Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The net gain (loss) relating to components of the gain (loss) on the cash flow hedging instrument excluded from the assessment of cash flow hedge effectiveness. Recognized in earnings.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) related to interest rate swaps	$ 0	$ 14,000,000
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Net derivative gains/(losses)	(69,000,000)	(32,000,000)
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	0	14,000,000
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	7,631,000,000		$ 8,679,000,000
Interest rate contracts \| Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Expected transfers of unrealized losses to earnings, within next 12 months or less	$ 61,000,000
Hedged forecasted transaction period	4 years 7 months
Net derivative gains/(losses)	$ (69,000,000)	(32,000,000)
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	0	14,000,000
Net investment hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, aggregate notional value	6,685,000,000		$ 6,678,000,000
Net derivative gains/(losses)	14,000,000	(11,000,000)
After-tax gains/(losses) on net investment contracts settled recorded as cumulative translation adjustment in other comprehensive income	0
Gains/(losses), net of taxes, reclassified from accumulated other comprehensive income into earnings	0
Net investment hedge contracts \| Net investment hedge debt
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses), net of taxes, recognized in income, excluded from effectiveness testing	$ 33,000,000	$ 17,000,000