Commitments and Contingencies - Principal Contractual Commitments Excluding Open Orders (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Debt principal and interest
Three Months Ended December 31, 2017	$ 1,182
Year Ended December 31, 2018	902
Year Ended December 31, 2019	2,212
Year Ended December 31, 2020	2,087
Year Ended December 31, 2021	1,833
Thereafter	33,849
Total	42,065
Operating leases
Three Months Ended December 31, 2017	925
Year Ended December 31, 2018	2,321
Year Ended December 31, 2019	2,254
Year Ended December 31, 2020	2,112
Year Ended December 31, 2021	1,922
Thereafter	12,535
Total	22,069
Unconditional purchase obligations
Three Months Ended December 31, 2017	817
Year Ended December 31, 2018	3,571
Year Ended December 31, 2019	3,412
Year Ended December 31, 2020	3,115
Year Ended December 31, 2021	2,984
Thereafter	10,895
Total	24,794
Other commitments
Three Months Ended December 31, 2017	384
Year Ended December 31, 2018	1,241
Year Ended December 31, 2019	849
Year Ended December 31, 2020	678
Year Ended December 31, 2021	522
Thereafter	4,338
Total	8,012
Total commitments
Three Months Ended December 31, 2017	4,949
Year Ended December 31, 2018	13,832
Year Ended December 31, 2019	13,157
Year Ended December 31, 2020	10,215
Year Ended December 31, 2021	8,196
Thereafter	66,178
Total	116,527
Accrued tax contingencies	2,100	$ 1,700
Capital lease obligations
Lease obligations, including interest
Three Months Ended December 31, 2017	1,543
Year Ended December 31, 2018	5,406
Year Ended December 31, 2019	4,024
Year Ended December 31, 2020	1,813
Year Ended December 31, 2021	514
Thereafter	671
Total	13,971
Current lease obligations	5,300	4,000
Noncurrent lease obligations	7,600	5,100
Finance lease obligations
Lease obligations, including interest
Three Months Ended December 31, 2017	98
Year Ended December 31, 2018	391
Year Ended December 31, 2019	406
Year Ended December 31, 2020	410
Year Ended December 31, 2021	421
Thereafter	3,890
Total	5,616
Current lease obligations	239	144
Noncurrent lease obligations	$ 4,300	$ 2,400

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