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Loans Payable, Long-Term Debt and Other Commitments - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Debt Instrument [Line Items] |  |
Long-term debt | $ 21,353 | $ 24,274
2.75% notes due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,488 | 2,487
Stated interest rate (as percent) | 2.75% |
3.70% notes due 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,973 | 1,972
Stated interest rate (as percent) | 3.70% |
2.80% notes due 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,744 | 1,743
Stated interest rate (as percent) | 2.80% |
5.00% notes due 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,260 | 1,273
Stated interest rate (as percent) | 5.00% |
4.15% notes due 2043 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,237 | 1,236
Stated interest rate (as percent) | 4.15% |
1.85% notes due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,232 | 1,238
Stated interest rate (as percent) | 1.85% |
2.35% notes due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,220 | 1,228
Stated interest rate (as percent) | 2.35% |
1.125% euro-denominated notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,185 | 1,035
Stated interest rate (as percent) | 1.125% |
1.875% euro-denominated notes due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,178 | 1,028
Stated interest rate (as percent) | 1.875% |
3.875% notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,140 | 1,152
Stated interest rate (as percent) | 3.875% |
2.40% notes due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 993 | 1,003
Stated interest rate (as percent) | 2.40% |
6.50% notes due 2033 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 729 | 806
Stated interest rate (as percent) | 6.50% |
Floating-rate notes due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 699 | 698
0.50% euro-denominated notes due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 591 | 516
Stated interest rate (as percent) | 0.50% |
1.375% euro-denominated notes due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 587 | 512
Stated interest rate (as percent) | 1.375% |
2.50% euro-denominated notes due 2034 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 585 | 511
Stated interest rate (as percent) | 2.50% |
3.60% notes due 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 489 | 489
Stated interest rate (as percent) | 3.60% |
6.55% notes due 2037 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 415 | 594
Stated interest rate (as percent) | 6.55% |
5.75% notes due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 338 | 369
Stated interest rate (as percent) | 5.75% |
5.95% debentures due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 306 | 355
Stated interest rate (as percent) | 5.95% |
5.85% notes due 2039 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 270 | 415
Stated interest rate (as percent) | 5.85% |
6.40% debentures due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 250 | 325
Stated interest rate (as percent) | 6.40% |
6.30% debentures due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 135 | 152
Stated interest rate (as percent) | 6.30% |
Floating-rate borrowing due 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 999
1.10% notes due 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 999
Stated interest rate (as percent) | 1.10% |
1.30% notes due 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 985
Stated interest rate (as percent) | 1.30% |
Other |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 309 | $ 154

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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