Commitments and Contingencies - Principal Contractual Commitments Excluding Open Orders (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Debt principal and interest
Six Months Ended December 31, 2017	$ 1,195
Year Ended December 31, 2018	327
Year Ended December 31, 2019	1,571
Year Ended December 31, 2020	467
Year Ended December 31, 2021	1,247
Thereafter	7,911
Total	12,718
Operating leases
Six Months Ended December 31, 2017	778
Year Ended December 31, 2018	1,463
Year Ended December 31, 2019	1,391
Year Ended December 31, 2020	1,257
Year Ended December 31, 2021	1,099
Thereafter	4,650
Total	10,638
Unconditional purchase obligations
Six Months Ended December 31, 2017	267
Year Ended December 31, 2018	634
Year Ended December 31, 2019	436
Year Ended December 31, 2020	190
Year Ended December 31, 2021	76
Thereafter	20
Total	1,623
Other commitments
Six Months Ended December 31, 2017	769
Year Ended December 31, 2018	1,190
Year Ended December 31, 2019	818
Year Ended December 31, 2020	664
Year Ended December 31, 2021	511
Thereafter	4,254
Total	8,206
Total commitments
Six Months Ended December 31, 2017	5,818
Year Ended December 31, 2018	8,393
Year Ended December 31, 2019	7,629
Year Ended December 31, 2020	3,998
Year Ended December 31, 2021	3,636
Thereafter	19,701
Total	49,175
Accrued tax contingencies	1,900	$ 1,700
Capital lease obligations
Lease obligations, including interest
Six Months Ended December 31, 2017	2,677
Year Ended December 31, 2018	4,492
Year Ended December 31, 2019	3,119
Year Ended December 31, 2020	1,122
Year Ended December 31, 2021	397
Thereafter	392
Total	12,199
Current lease obligations	4,900	4,000
Noncurrent lease obligations	6,900	5,100
Finance lease obligations
Lease obligations, including interest
Six Months Ended December 31, 2017	132
Year Ended December 31, 2018	287
Year Ended December 31, 2019	294
Year Ended December 31, 2020	298
Year Ended December 31, 2021	306
Thereafter	2,474
Total	3,791
Current lease obligations	173	144
Noncurrent lease obligations	$ 2,900	$ 2,400

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