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Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Maturity of the notional amounts of derivative financial instruments |  |  |
Remaining Life Less Than 1 Year |  | $ 26,766 |
Remaining Life - 1 - 5 Years |  | 30,944 |
Remaining Life - 6 - 10 Years |  | 32,286 |
Remaining Life - 11 - 30 Years |  | 16,945 |
Remaining Life Over - 30 Years |  | 3,409 |
Remaining Life - Total Years |  | 110,350 | $ 104,926
Interest rate contracts [Member] |  |  |
Maturity of the notional amounts of derivative financial instruments |  |  |
Remaining Life Less Than 1 Year | [1] | 7,998 |
Remaining Life - 1 - 5 Years | [1] | 20,953 |
Remaining Life - 6 - 10 Years | [1] | 31,378 |
Remaining Life - 11 - 30 Years | [1] | 15,840 |
Remaining Life Over - 30 Years | [1] | 1,213 |
Remaining Life - Total Years | [1] | $ 77,382 |
Derivative maturity date |  | Apr. 20, 2067 |
Foreign currency contracts [Member] |  |  |
Maturity of the notional amounts of derivative financial instruments |  |  |
Remaining Life Less Than 1 Year | [2] | $ 22 |
Remaining Life - 1 - 5 Years | [2] | 247 |
Remaining Life - 6 - 10 Years | [2] | 423 |
Remaining Life - 11 - 30 Years | [2] | 1,090 |
Remaining Life Over - 30 Years | [2] | 44 |
Remaining Life - Total Years | [2] | $ 1,826 |
Derivative maturity date |  | Sep. 18, 2049 |
Equity market contracts [Member] |  |  |
Maturity of the notional amounts of derivative financial instruments |  |  |
Remaining Life Less Than 1 Year |  | $ 18,746 |
Remaining Life - 1 - 5 Years |  | 9,692 |
Remaining Life - 6 - 10 Years |  | 485 |
Remaining Life - 11 - 30 Years |  | 15 |
Remaining Life Over - 30 Years |  | 2,152 |
Remaining Life - Total Years |  | 31,090 |
Credit contracts [Member] |  |  |
Maturity of the notional amounts of derivative financial instruments |  |  |
Remaining Life Less Than 1 Year |  |  |
Remaining Life - 1 - 5 Years |  | 52 |
Remaining Life - 6 - 10 Years |  |  |
Remaining Life - 11 - 30 Years |  |  |
Remaining Life Over - 30 Years |  |  |
Remaining Life - Total Years |  | $ 52 |
[1] | As of December 31, 2017, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2067.
[2] | As of December 31, 2017, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was September 2049.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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- Definition Total notional amounts of derivative financial instruments maturing in 11 - 30 years. + References No definition available. + Details
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- Definition Total notional amounts of derivative financial instruments maturing in 1 - 5 years. + References No definition available. + Details
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- Definition Total notional amounts of derivative financial instruments maturing in 6 - 10 years. + References No definition available. + Details
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- Definition Total notional amounts of derivative financial instruments maturing in less than 1 year. + References No definition available. + Details
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- Definition Total notional amounts of derivative financial instruments with maturity dates over 30 years + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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