Commitments and Contingencies - Principal Contractual Commitments Excluding Open Orders (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Long-term debt principal and interest
Six Months Ended December 31, 2019	$ 1,605
Year Ended December 31, 2020	2,190
Year Ended December 31, 2021	2,809
Year Ended December 31, 2022	3,271
Year Ended December 31, 2023	4,272
Thereafter	38,738
Total	52,885
Operating lease liabilities
Six Months Ended December 31, 2019	2,070
Year Ended December 31, 2020	4,313
Year Ended December 31, 2021	3,884
Year Ended December 31, 2022	3,508
Year Ended December 31, 2023	3,193
Thereafter	19,080
Gross lease liabilities - operating leases	36,048	$ 31,963
Finance lease liabilities, including interest
Six Months Ended December 31, 2019	5,101
Year Ended December 31, 2020	9,227
Year Ended December 31, 2021	5,628
Year Ended December 31, 2022	2,071
Year Ended December 31, 2023	1,136
Thereafter	5,624
Gross lease liabilities - finance leases	28,787	28,875
Financing obligations, including interest
Six Months Ended December 31, 2019	71
Year Ended December 31, 2020	144
Year Ended December 31, 2021	146
Year Ended December 31, 2022	149
Year Ended December 31, 2023	151
Thereafter	2,447
Total	3,108
Unconditional purchase obligations
Six Months Ended December 31, 2019	1,424
Year Ended December 31, 2020	3,990
Year Ended December 31, 2021	3,459
Year Ended December 31, 2022	3,152
Year Ended December 31, 2023	3,031
Thereafter	2,361
Total	17,417
Other commitments
Six Months Ended December 31, 2019	2,113
Year Ended December 31, 2020	3,480
Year Ended December 31, 2021	2,800
Year Ended December 31, 2022	2,156
Year Ended December 31, 2023	2,131
Thereafter	21,011
Total	33,691
Accrued tax contingencies	3,700	$ 3,900
Total commitments
Six Months Ended December 31, 2019	12,384
Year Ended December 31, 2020	23,344
Year Ended December 31, 2021	18,726
Year Ended December 31, 2022	14,307
Year Ended December 31, 2023	13,914
Thereafter	89,261
Total	$ 171,936

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