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Borrowings and Lines of Credit (Long-Term Debt) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Project financing obligations |  | $ 130 | $ 155
Other (including capitalized leases) |  | 188 | 189
Total principal long-term debt |  | 23,382 | 23,299
Other (fair market value adjustments and discounts) |  | 0 | 1
Total long-term debt |  | 23,382 | 23,300
Less: current portion |  | 2,484 | 1,603
Long-term debt, net of current portion |  | $ 20,898 | 21,697
Notes 1.800% Due 2017 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.80% |
Debt Instrument, Maturity Date, Description |  | 2017 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 1,500 | 1,500
Notes 6.800% Due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% |
Debt Instrument, Maturity Date, Description |  | 2018 |
Debt Instrument, Carrying Amount |  | $ 99 | 99
Floating rate notes due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date, Description |  | 2018 |
Debt Instrument, Call Feature |  | The three-month EURIBOR rate as of March 31, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation. |
Debt Instrument, Carrying Amount | [2] | $ 811 | 783
Debt Instrument, Interest Rate Terms |  | EURIBOR plus 0.800% floating rate notes due 2018 (€750 million principal value) 2 |
Notes 1.778% due 2018 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.778% |
Debt Instrument, Maturity Date, Description |  | 2018 |
Debt Instrument, Carrying Amount |  | $ 1,100 | 1,100
LIBOR plus 0.350% floating rate notes due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date, Description |  | 2019 |
Debt Instrument, Call Feature |  | The three-month LIBOR rate as of March 31, 2017 was approximately 1.150%. |
Debt Instrument, Carrying Amount |  | $ 350 | 350
Debt Instrument, Interest Rate Terms |  | LIBOR plus 0.350% floating rate notes due 2019 3 |
Notes 1.500% notes 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.50% |
Debt Instrument, Maturity Date, Description |  | 2019 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 650 | 650
Notes 8.875% Due 2019 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.875% |
Debt Instrument, Maturity Date, Description |  | 2019 |
Debt Instrument, Carrying Amount |  | $ 271 | 271
Notes 4.875% Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.875% |
Debt Instrument, Maturity Date, Description |  | 2020 |
Debt Instrument, Carrying Amount |  | $ 171 | 171
Notes 4.500% Due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |
Debt Instrument, Maturity Date, Description |  | 2020 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 1,250 | 1,250
Notes 8.750% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.75% |
Debt Instrument, Maturity Date, Description |  | 2021 |
Debt Instrument, Carrying Amount |  | $ 250 | 250
Notes 1.950% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date, Description |  | 2021 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 750 | 750
Debt Instrument, Interest Rate Terms |  | 0.01950 |
Note 1.125% Due 2021 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.125% |
Debt Instrument, Maturity Date, Description |  | 2021 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 1,027 | 992
Notes 3.100% Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.10% |
Debt Instrument, Maturity Date, Description |  | 2022 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 2,300 | 2,300
Notes 1.250% due 2023 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.25% |
Debt Instrument, Maturity Date, Description |  | 2023 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [3] | $ 811 | 783
Notes 1.875% Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.875% |
Debt Instrument, Maturity Date, Description |  | 2026 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 540 | 522
Notes 2.650% Due 2026 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.65% |
Debt Instrument, Maturity Date, Description |  | 2026 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 1,150 | 1,150
Notes 7.100% Due 2027 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.10% |
Debt Instrument, Maturity Date, Description |  | 2027 |
Debt Instrument, Carrying Amount |  | $ 141 | 141
Notes 6.700% Due 2028 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.70% |
Debt Instrument, Maturity Date, Description |  | 2028 |
Debt Instrument, Carrying Amount |  | $ 400 | 400
Notes 7.500% Due 2029 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.50% |
Debt Instrument, Maturity Date, Description |  | 2029 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 550 | 550
Notes 5.400% Due 2035 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% |
Debt Instrument, Maturity Date, Description |  | 2035 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 600 | 600
Notes 6.050% Due 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.05% |
Debt Instrument, Maturity Date, Description |  | 2036 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 600 | 600
Notes 6.800% Due 2036 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.80% |
Debt Instrument, Maturity Date, Description |  | 2036 |
Debt Instrument, Carrying Amount |  | $ 134 | 134
Notes 7.000% Due 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 7.00% |
Debt Instrument, Maturity Date, Description |  | 2038 |
Debt Instrument, Carrying Amount |  | $ 159 | 159
Notes 6.125% Due 2038 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.125% |
Debt Instrument, Maturity Date, Description |  | 2038 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 1,000 | 1,000
Notes 5.700% Due 2040 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.70% |
Debt Instrument, Maturity Date, Description |  | 2040 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 1,000 | 1,000
Notes 4.500% Due 2042 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |
Debt Instrument, Maturity Date, Description |  | 2042 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount | [1] | $ 3,500 | 3,500
Notes 4.150% Due 2045 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.15% |
Debt Instrument, Maturity Date, Description |  | 2045 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 850 | 850
Notes 3.750% Due 2046 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Maturity Date, Description |  | 2046 |
Debt Instrument, Call Feature |  | We may redeem these notes at our option pursuant to their terms. |
Debt Instrument, Carrying Amount |  | $ 1,100 | $ 1,100
Debt Instrument, Interest Rate Terms |  | .03750 |
[1] | We may redeem these notes at our option pursuant to their terms.
[2] | The three-month EURIBOR rate as of March 31, 2017 was approximately -0.329%. The notes may be redeemed at our option in whole, but not in part, at any time in the event of certain developments affecting U.S. taxation.
[3] | The three-month LIBOR rate as of March 31, 2017 was approximately 1.150%.

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