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Loans Payable, Long-Term Debt and Other Commitments - Long-Term Debt (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Debt Instrument [Line Items] |  |
Long-term debt | $ 19,806 | $ 21,353
2.75% notes due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,490 | 2,488
Stated interest rate (as percent) | 2.75% |
3.70% notes due 2045 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,974 | 1,973
Stated interest rate (as percent) | 3.70% |
2.80% notes due 2023 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,745 | 1,744
Stated interest rate (as percent) | 2.80% |
4.15% notes due 2043 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,237 | 1,237
Stated interest rate (as percent) | 4.15% |
1.85% notes due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,231 | 1,232
Stated interest rate (as percent) | 1.85% |
2.35% notes due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,214 | 1,220
Stated interest rate (as percent) | 2.35% |
1.125% euro-denominated notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,134 | 1,185
Stated interest rate (as percent) | 1.125% |
3.875% notes due 2021 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,132 | 1,140
Stated interest rate (as percent) | 3.875% |
1.875% euro-denominated notes due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,127 | 1,178
Stated interest rate (as percent) | 1.875% |
2.40% notes due 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 983 | 993
Stated interest rate (as percent) | 2.40% |
6.50% notes due 2033 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 726 | 729
Stated interest rate (as percent) | 6.50% |
Floating-rate notes due 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 699 | 699
0.50% euro-denominated notes due 2024 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 565 | 591
Stated interest rate (as percent) | 0.50% |
1.375% euro-denominated notes due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 561 | 587
Stated interest rate (as percent) | 1.375% |
2.50% euro-denominated notes due 2034 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 560 | 585
Stated interest rate (as percent) | 2.50% |
3.60% notes due 2042 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 490 | 489
Stated interest rate (as percent) | 3.60% |
6.55% notes due 2037 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 414 | 415
Stated interest rate (as percent) | 6.55% |
5.75% notes due 2036 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 338 | 338
Stated interest rate (as percent) | 5.75% |
5.95% debentures due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 306 | 306
Stated interest rate (as percent) | 5.95% |
5.85% notes due 2039 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 270 | 270
Stated interest rate (as percent) | 5.85% |
6.40% debentures due 2028 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 250 | 250
Stated interest rate (as percent) | 6.40% |
6.30% debentures due 2026 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 135 | 135
Stated interest rate (as percent) | 6.30% |
5.00% notes due 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 1,260
Stated interest rate (as percent) | 5.00% |
Other |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 225 | $ 309

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