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Derivative Financial Instruments - Credit-Risk Related Contingent Features (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Moody's Short Term Ratings P 1 [Member] | Moody's Long Term Ratings A1 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives $ 0
Moody's Short Term Ratings P 1 [Member] | Moody's Long Term Ratings A2 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 34
Moody's Short Term Ratings P 1 [Member] | Moody's Long Term Ratings A3 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 144
Moody's Short Term Ratings P 2 [Member] | Moody's Long Term Ratings A1 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 1
Moody's Short Term Ratings P 2 [Member] | Moody's Long Term Ratings A2 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 34
Moody's Short Term Ratings P 2 [Member] | Moody's Long Term Ratings A3 [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 144
S&P Short Term Ratings A 1 [Member] | S&P Long Term Ratings AA- [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 0
S&P Short Term Ratings A 1 [Member] | S&P Long Term Ratings A [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 0
S&P Short Term Ratings A 1 [Member] | S&P Long Term Ratings A [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 33
S&P Short Term Rating A 1 [Member] | S&P Long Term Ratings AA- [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 5
S&P Short Term Rating A 1 [Member] | S&P Long Term Ratings A [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives 5
S&P Short Term Rating A 1 [Member] | S&P Long Term Ratings A [Member]
 
Credit Derivatives [Line Items]  
Total Credit Rating Scenario of Derivatives $ 38