Fair Value (Detail) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | $ 2,334 | $ 1,701 |
Derivative assets, Fair Value Disclosure | 1,011 | 1,231 |
Derivative liabilities, Fair Value Disclosure | 1,724 | 1,337 |
Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets, Fair Value Disclosure | 26,836 | 30,392 |
Liabilities, Fair Value Disclosure | 1,732 | 1,384 |
Fair Value, Nonrecurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Grants & loans Receivable, Reverse repurchase agreements, CV | 833 | 437 |
Short-term and Long-term Debt, Fair Value | 43,500 | 34,300 |
Marketable Equity Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,117 | 1,341 |
Cash Equivalents [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | 2,334 | 1,301 |
Cash Equivalents [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,074 | 856 |
Cash Equivalents [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 3,655 | 8,373 |
Cash Equivalents [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 49 | 0 |
Short-Term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 6,168 | 5,381 |
Short-Term Investments [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 4,140 | 4,925 |
Short-Term Investments [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 7,101 | 6,888 |
Other Current Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 1,144 | 1,264 |
Loans receivable, Fair Value Disclosure | 53 | 53 |
Other Long-Term Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 1 | 10 |
Other Accrued Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 891 | 685 |
Other Long-Term Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 841 | 699 |
Level 1 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets, Fair Value Disclosure | 3,112 | 8,484 |
Liabilities, Fair Value Disclosure | 17 | 111 |
Level 1 [Member] | Marketable Equity Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,117 | 1,341 |
Level 1 [Member] | Cash Equivalents [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | 0 | 0 |
Level 1 [Member] | Cash Equivalents [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 1 [Member] | Cash Equivalents [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,779 | 6,899 |
Level 1 [Member] | Cash Equivalents [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 1 [Member] | Short-Term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 1 [Member] | Short-Term Investments [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 35 | 196 |
Level 1 [Member] | Short-Term Investments [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 50 | 48 |
Level 1 [Member] | Other Current Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 131 | 0 |
Loans receivable, Fair Value Disclosure | 0 | 0 |
Level 1 [Member] | Other Long-Term Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 0 | 0 |
Level 1 [Member] | Other Accrued Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 17 | 111 |
Level 1 [Member] | Other Long-Term Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 0 | 0 |
Level 2 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets, Fair Value Disclosure | 23,724 | 21,908 |
Liabilities, Fair Value Disclosure | 1,568 | 1,184 |
Level 2 [Member] | Fair Value, Nonrecurring [Member] | Reported Value Measurement [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | | 400 |
Level 2 [Member] | Marketable Equity Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 2 [Member] | Cash Equivalents [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | 2,334 | 1,301 |
Level 2 [Member] | Cash Equivalents [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,074 | 856 |
Level 2 [Member] | Cash Equivalents [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 1,876 | 1,474 |
Level 2 [Member] | Cash Equivalents [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 49 | 0 |
Level 2 [Member] | Short-Term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 6,168 | 5,381 |
Level 2 [Member] | Short-Term Investments [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 4,105 | 4,729 |
Level 2 [Member] | Short-Term Investments [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 7,051 | 6,840 |
Level 2 [Member] | Other Current Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 1,013 | 1,264 |
Loans receivable, Fair Value Disclosure | 53 | 53 |
Level 2 [Member] | Other Long-Term Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 1 | 10 |
Level 2 [Member] | Other Accrued Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 727 | 485 |
Level 2 [Member] | Other Long-Term Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 841 | 699 |
Level 3 [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Assets, Fair Value Disclosure | 0 | 0 |
Liabilities, Fair Value Disclosure | 147 | 89 |
Level 3 [Member] | Marketable Equity Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Cash Equivalents [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Reverse repurchase agreements | 0 | 0 |
Level 3 [Member] | Cash Equivalents [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Cash Equivalents [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Cash Equivalents [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Short-Term Investments [Member] | Corporate Debt Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Short-Term Investments [Member] | Fixed Income Securities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Short-Term Investments [Member] | Government Debt [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Investments, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Other Current Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 0 | 0 |
Loans receivable, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Other Long-Term Assets [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets, Fair Value Disclosure | 0 | 0 |
Level 3 [Member] | Other Accrued Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | 147 | 89 |
Level 3 [Member] | Other Long-Term Liabilities [Member] | Fair Value, Recurring [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative liabilities, Fair Value Disclosure | $ 0 | $ 0 |