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Loans Payable, Long-Term Debt and Other Commitments - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Loans payable and current portion of long-term debt |  | $ 5,308,000,000 | $ 3,057,000,000 |
Long-term debt, current maturities |  |  | 3,000,000,000 |
Long-term debt |  | 19,806,000,000 | 21,353,000,000 |
Debt extinguishment amount | $ 810,000,000 |  |  |
Repurchased face amount | $ 585,000,000 |  |  |
Loss on extinguishment of debt |  |  | 191,000,000 |
Long-term debt, maturities, repayments of principal in 2019 |  | 0 |  |
Long-term debt, maturities, repayments of principal in 2020 |  | 1,900,000,000 |  |
Long-term debt, maturities, repayments of principal in 2021 |  | 2,300,000,000 |  |
Long-term debt, maturities, repayments of principal in 2022 |  | 2,200,000,000 |  |
Long-term debt, maturities, repayments of principal in 2023 |  | 1,700,000,000 |  |
Available borrowing capacity under credit facility |  | 6,000,000,000.0 |  |
Rental expense under operating leases net of sublease income |  | 322,000,000 | 327,000,000 | $ 292,000,000
Minimum aggregate rental commitments under noncancellable leases in 2019 |  | 188,000,000 |  |
Minimum aggregate rental commitments under noncancellable leases in 2020 |  | 198,000,000 |  |
Minimum aggregate rental commitments under noncancellable leases in 2021 |  | 150,000,000 |  |
Minimum aggregate rental commitments under noncancellable leases in 2022 |  | 134,000,000 |  |
Minimum aggregate rental commitments under noncancellable leases in 2023 |  | 84,000,000 |  |
Minimum aggregate rental commitments under noncancellable leases thereafter |  | $ 243,000,000 |  |
5.00% notes due 2019 | Interest Rate Swap |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate (as percent) |  | 5.00% |  |
Repurchased face amount |  | $ 1,250,000,000.00 |  |
Other Variable Rate Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 223,000,000 | $ 300,000,000 |
Effective interest rate (as percent) |  | 2.27% | 1.42% |
6.30% debentures due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 135,000,000 | $ 135,000,000 |
Stated interest rate (as percent) |  | 6.30% |  |
Notes Subject To Repayment At Option Of Holder |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loans payable and current portion of long-term debt |  | $ 149,000,000 | $ 73,000,000 |
Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Loans payable and current portion of long-term debt |  | $ 5,100,000,000 |  |
Weighted-average interest rate of commercial paper (as percent) |  | 2.09% | 0.85% |

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