Fair Value - Partnership's Financial Assets at Fair Value (Detail) - USD ($) $ in Millions | Jun. 24, 2016 | Dec. 31, 2015 |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | $ 2,701 | $ 3,006 |
Investment securities: | | |
Total investment securities | 202 | 201 |
Inventory securities: | | |
Total inventory securities | 68 | 36 |
Equities [Member] | | |
Investment securities: | | |
Total investment securities | 5 | 4 |
Inventory securities: | | |
Total inventory securities | 6 | 17 |
Corporate Bonds and Notes [Member] | | |
Investment securities: | | |
Total investment securities | 1 | 1 |
Inventory securities: | | |
Total inventory securities | 2 | 1 |
Government and Agency Obligations [Member] | | |
Investment securities: | | |
Total investment securities | 4 | 4 |
U.S. Treasuries [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 2,401 | 2,706 |
Mutual Funds [Member] | | |
Investment securities: | | |
Total investment securities | 192 | 192 |
Inventory securities: | | |
Total inventory securities | 14 | 7 |
State and Municipal Obligations [Member] | | |
Inventory securities: | | |
Total inventory securities | 33 | 11 |
Level I [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 2,401 | 2,706 |
Investment securities: | | |
Total investment securities | 201 | 200 |
Inventory securities: | | |
Total inventory securities | 20 | 24 |
Level I [Member] | Equities [Member] | | |
Investment securities: | | |
Total investment securities | 5 | 4 |
Inventory securities: | | |
Total inventory securities | 6 | 17 |
Level I [Member] | Corporate Bonds and Notes [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level I [Member] | Government and Agency Obligations [Member] | | |
Investment securities: | | |
Total investment securities | 4 | 4 |
Level I [Member] | U.S. Treasuries [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 2,401 | 2,706 |
Level I [Member] | Mutual Funds [Member] | | |
Investment securities: | | |
Total investment securities | 192 | 192 |
Inventory securities: | | |
Total inventory securities | 14 | 7 |
Level I [Member] | State and Municipal Obligations [Member] | | |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level II [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 300 | 300 |
Investment securities: | | |
Total investment securities | 1 | 1 |
Inventory securities: | | |
Total inventory securities | 48 | 12 |
Level II [Member] | Equities [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level II [Member] | Corporate Bonds and Notes [Member] | | |
Investment securities: | | |
Total investment securities | 1 | 1 |
Inventory securities: | | |
Total inventory securities | 2 | 1 |
Level II [Member] | Government and Agency Obligations [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Level II [Member] | U.S. Treasuries [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 0 | 0 |
Level II [Member] | Mutual Funds [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level II [Member] | State and Municipal Obligations [Member] | | |
Inventory securities: | | |
Total inventory securities | 33 | 11 |
Level III [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 0 | 0 |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level III [Member] | Equities [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level III [Member] | Corporate Bonds and Notes [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level III [Member] | Government and Agency Obligations [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Level III [Member] | U.S. Treasuries [Member] | | |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 0 | 0 |
Level III [Member] | Mutual Funds [Member] | | |
Investment securities: | | |
Total investment securities | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Level III [Member] | State and Municipal Obligations [Member] | | |
Inventory securities: | | |
Total inventory securities | 0 | 0 |
Certificates of Deposit [Member] | | |
Cash equivalents: | | |
Cash and cash equivalents | 150 | 150 |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 300 | 300 |
Inventory securities: | | |
Total inventory securities | 13 | |
Certificates of Deposit [Member] | Level I [Member] | | |
Cash equivalents: | | |
Cash and cash equivalents | 0 | 0 |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 0 | 0 |
Inventory securities: | | |
Total inventory securities | 0 | |
Certificates of Deposit [Member] | Level II [Member] | | |
Cash equivalents: | | |
Cash and cash equivalents | 150 | 150 |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 300 | 300 |
Inventory securities: | | |
Total inventory securities | 13 | |
Certificates of Deposit [Member] | Level III [Member] | | |
Cash equivalents: | | |
Cash and cash equivalents | 0 | 0 |
Investments segregated under federal regulations: | | |
Total investments segregated under federal regulations | 0 | $ 0 |
Inventory securities: | | |
Total inventory securities | $ 0 | |