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Fair Value Measurements - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	$ 9,342,000,000	$ 4,813,000,000	$ 6,988,000,000	$ 11,022,000,000
Time deposits	950,000,000	0
Carrying/fair value of investments not included in cash and cash equivalents	1,139,000,000	1,130,000,000
Carrying amount of long-term debt	23,730,000,000	30,234,000,000
Corporate Bond Securities | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	17,858,000,000
Other Long-term Debt | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of debt	871,000,000
Carrying Amount of Long-term Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of long-term debt	18,706,000,000	23,477,000,000
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amount of long-term debt	$ 18,729,000,000	$ 23,943,000,000
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity period of primarily bank time deposits, classified as cash equivalents, maximum	90 days

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of time deposit liabilities, including certificates of deposit.

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