Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	$ 957	$ 806
Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	957	806
Available-for-sale Debt Securities, Amortized Cost Basis, Current	238	237
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, Current, before Tax	4	8
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, Current, before Tax	0	0
Debt Securities, Available-for-sale, Current	242	245
Debt Securities, Available-for-sale, Amortized Cost	2,004	1,997
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	56	110
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(114)	(48)
Debt Securities, Available-for-sale	1,946	2,059
Equity Securities, Amortized Cost Basis	5	7
Equity Securities, Accumulated Gross Unrealized Gain, Before Tax	11	13
Equity Securities, Accumulated Gross Unrealized Loss, Before Tax	0	0
Equity Securities, Fair Value	16	20
Other Investments and Securities, at Cost	2,009	2,004
Other Investments and Securities, Accumulated Gross Unrealized Gain, Before Tax	67	123
Other Investments and Securities, Accumulated Gross Unrealized Loss, Before Tax	(114)	(48)
Investments, Fair Value Disclosure	1,962	2,079
Cash Equivalents, Marketable Securities and Other Investments, Amortized Cost Basis	3,204	3,047
Cash Equivalents, Marketable Securities and Other Investments, Accumulated Gross Unrealized Gain, Before Tax	71	131
Cash Equivalents, Marketable Securities and Other Investments, Accumulated Gross Unrealized Loss, Before Tax	(114)	(48)
Cash Equivalents, Marketable Securities and Other Investments, Fair Value	3,161	3,130
Long-term Debt	(14,463)	(14,511)
Long Term Debt, Accumulated Gross Unrealized Gain, Before Tax	567	27
Long Term Debt, Accumulated Gross Unrealized Loss, Before Tax	(1,424)	(2,641)
Long-term Debt, Fair Value	(15,320)	(17,125)
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	422	189
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(212)	(250)
Derivative Assets (Liabilities), at Fair Value, Net	210	(61)
Long Term Debt, Accumulated Fair Value Adjustment	47	47
Derivative, Amount of Hedged Item	2,279
Interest Rate Contract [Member]
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	27	1
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(13)	(140)
Derivative Assets (Liabilities), at Fair Value, Net	14	(139)
Foreign Exchange Contract [Member]
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	64	46
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(64)	(18)
Derivative Assets (Liabilities), at Fair Value, Net	0	28
Commodity Contract [Member]
Debt Securities, Available-for-sale [Line Items]
Derivative Assets (Liabilities), Accumulated Gross Unrealized Gain, Before Tax	331	142
Derivative Assets (Liabilities), Accumulated Gross Unrealized Loss, Before Tax	(135)	(92)
Derivative Assets (Liabilities), at Fair Value, Net	196	50
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	734	746
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5	17
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(64)	(28)
Debt Securities, Available-for-sale	675	735
Corporate Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,270	1,251
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	51	93
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(50)	(20)
Debt Securities, Available-for-sale	1,271	1,324
Held-to-maturity Securities
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	377	317
Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	377	317
Money Market Funds
Debt Securities, Available-for-sale [Line Items]
Cash Equivalents, at Carrying Value	580	489
Cash Equivalents, Accumulated Gross Unrealized Gain, Before Tax	0	0
Cash Equivalents, Accumulated Gross Unrealized Loss, Before Tax	0	0
Cash Equivalents, Fair Value	$ 580	$ 489