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Derivative Instruments and Hedging Activity - Additional Disclosures (Details) $ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Apr. 30, 2018 CAD ($) | Dec. 31, 2017 USD ($)
Interest Rate Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | $ 8,590 |  |  | $ 3,609
Net losses included in AOCI expected to be reclassified into interest expense within the next 12 months | 5 |  |  |
Foreign Currency Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount | 53 |  |  | 62
Losses related to foreign currency contract | 1 | $ (1) |  |
Credit Risk Related Contingent Contracts [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Fair value of derivative instruments, liabilities | $ 116 |  |  | $ 17
Subsequent Event [Member] | Foreign Currency Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional amount |  |  | $ 741 |

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- Definition Aggregate impact of foreign currency derivatives on earnings for the period. Includes impact of foreign currency cash flow hedge ineffectiveness and the ineffectiveness of fair value hedging derivatives and full change in fair value of the foreign currency derivatives not designated 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 -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 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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