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Fair Value Measurements - Assets and Liabilities at Fair Value, Recurring (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Not Designated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives - not designated	$ 51	$ 74
Derivatives - not designated	133	173
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Total Assets at Fair Value	15
Recurring Basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Marketable Securities	32	31
Total Assets at Fair Value	83	105
Total Liabilities at Fair Value	133	173
Recurring Basis | Not Designated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives - not designated	51	74
Derivatives - not designated	133	173
Recurring Basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Marketable Securities	32	31
Total Assets at Fair Value	50	68
Total Liabilities at Fair Value	86	58
Recurring Basis | Level 1 | Not Designated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives - not designated	18	37
Derivatives - not designated	86	58
Recurring Basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Marketable Securities	0	0
Total Assets at Fair Value	33	37
Total Liabilities at Fair Value	47	115
Recurring Basis | Level 2 | Not Designated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives - not designated	33	37
Derivatives - not designated	47	115
Recurring Basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Marketable Securities	0	0
Total Assets at Fair Value	0	0
Total Liabilities at Fair Value	0	0
Recurring Basis | Level 3 | Not Designated
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract]
Derivatives - not designated	0	0
Derivatives - not designated	$ 0	$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value of financial and nonfinancial obligations.

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