Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes - Narrative (Details)
Federal statutory rate			21.00%	21.00%	35.00%
Income Tax Expense (Benefit)			$ (204)	$ 2,339	$ 8,885
Deferred Tax Liabilities, Intangible Assets	$ 1,401	$ 1,656	1,401	1,656
Deferred Tax Assets, Intangible Assets	1,232	0	1,232	0
Income taxes payable			272	(1,459)	5,497
Other accrued liabilities	3,074	3,139	3,074	3,139
Long-term income taxes payable	6,115	5,922	6,115	5,922
Deferred Tax Assets, Valuation Allowance	217	331	217	331
Total Gross Unrecognized Tax Benefits	2,031	1,595	2,031	1,595	2,181	$ 1,852
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,600	1,300	1,600	1,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense			105
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	259	154	259	154
Tax Adjustments, Settlements, and Unusual Provisions	114
Tax Cuts and Jobs Act of 2017 [Member]
Income Taxes - Narrative (Details)
Income Tax Expense (Benefit)					$ 5,500
Domestic Tax Authority [Member]
Income Taxes - Narrative (Details)
Operating Loss Carryforwards	231		231
Tax Credit Carryforward, Amount	88		88
State and Local Jurisdiction [Member]
Income Taxes - Narrative (Details)
Operating Loss Carryforwards	1,400		1,400
Tax Credit Carryforward, Amount	543		543
Intangible Asset Transfer [Member]
Income Taxes - Narrative (Details)
Income Tax Expense (Benefit)	(1,200)	588
Deferred Tax Liabilities, Intangible Assets		$ 588		$ 588
Deferred Tax Assets, Intangible Assets	$ 1,200		$ 1,200