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)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Fair value, after effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Excludes assets not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Excludes liabilities not subject to a master netting arrangement.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4D
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

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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- Definition

The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8,17)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) related to interest rate swaps	$ 14,000,000	$ 0
Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gains/(losses), net of taxes recognized in earnings/(losses)	(32,000,000)	11,000,000
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings	(14,000,000)	7,000,000
Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	7,477,000,000		$ 6,532,000,000
Interest rate contracts \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Expected transfers of unrealized gains (losses) to earnings, within next 12 months or less	1,000,000
Gains/(losses), net of taxes recognized in earnings/(losses)	(32,000,000)	18,000,000
After-tax gains/(losses) reclassified from accumulated other comprehensive income into earnings	(14,000,000)	$ 0
Net investment hedge contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, notional amount	6,608,000,000		0
Gains/(losses), net of taxes recognized in earnings/(losses)	(11,000,000)
After-tax gains/(losses) 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	$ 17,000,000
Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Hedged forecasted transaction period	5 years 8 months
Quoted Prices in Active Markets for Identical Assets (Level 1)
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liabilities after effects of netting	$ 15,000,000		0
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Exchange Traded Options
Derivative Instruments, Gain (Loss) [Line Items]
Derivative assets after effects of netting	30,000,000		34,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Exchange Traded Options \| Other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Margin deposits related to exchange traded derivatives	$ 38,000,000		$ 171,000,000