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Balance Sheet Amounts Associated With Medicare Part D (Detail) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Other current assets | $ 5,568 | $ 4,712
Trade accounts payable and accrued expenses | (4,074) | (2,212)
Other long-term assets | 2,465 | 2,475
Other long-term liabilities | (278) | (235)
Risk Corridor Settlement |  |
Segment Reporting Information [Line Items] |  |
Other current assets | 33 | 25
Trade accounts payable and accrued expenses | (44) | (47)
Net current (liability) asset | (11) | (22)
Other long-term assets | 49 | 0
Other long-term liabilities | (29) | 0
Net long-term asset | 20 | 0
Total net (liability) asset | 9 | (22)
CMS Subsidies/ Discounts |  |
Segment Reporting Information [Line Items] |  |
Other current assets | 2,408 | 2,082
Trade accounts payable and accrued expenses | (704) | (63)
Net current (liability) asset | 1,704 | 2,019
Other long-term assets | 0 | 0
Other long-term liabilities | 0 | 0
Net long-term asset | 0 | 0
Total net (liability) asset | $ 1,704 | $ 2,019

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