Derivative And Credit-Related Financial Instruments Derivative and Credit-Related Financial Instruments (Schedule of the Effects of Fair Value Hedging on the Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Millions |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
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| Total interest on medium- and long-term debt | [1] | $ 25 | $ 17 | |
| Swaps - fair value - receive fixed/pay floating | Risk management purposes | Interest rate swap | ||||
| Interest rate contract: Hedge items interest expense | 15 | 22 | ||
| Interest rate contracts: Derivatives designated as hedging instruments net interest income | $ (3) | $ (10) | ||
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