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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 09, 2018	Mar. 31, 2018	Mar. 31, 2017	Jan. 02, 2018	Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year		$ 37,695
Total other comprehensive income		344	$ 9
End of year		38,677
Payments received from termination of cash flow hedge	$ 446	446
Gains recorded in accumulated other comprehensive income	331
Cash flow hedge gains expected to be reclassified in next 12 months		24
Foreign Currency
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year			(127)
Beginning of the year, adjusted				$ (129)
Other comprehensive income (loss) before reclassifications		1	8
Total other comprehensive income		1	8
End of year		(128)	(119)
Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year			(5)
Beginning of the year, adjusted				(18)
Other comprehensive income (loss) before reclassifications		344
Amounts reclassified from accumulated other comprehensive income		(1)	1
Total other comprehensive income		343	1
End of year		325	(4)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year			(173)
Beginning of the year, adjusted				(25)
End of year		(25)	(173)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year			(305)
Beginning of the year, adjusted				$ (172)
Other comprehensive income (loss) before reclassifications		345	8
Amounts reclassified from accumulated other comprehensive income		(1)	1
Total other comprehensive income		344	9
End of year		172	$ (296)
Adjustments Early Adoption | ASU 2018-02 | Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) rollforward
Retained earnings adjustment					$ (3)
Adjustments Early Adoption | ASU 2018-02 | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) rollforward
Retained earnings adjustment					(4)
Adjustments Early Adoption | ASU 2018-02 | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) rollforward
Retained earnings adjustment					$ (7)
Previously Reported | Foreign Currency
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year		(129)
Previously Reported | Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year		(15)
Previously Reported | Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year		(21)
Previously Reported | Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) rollforward
Beginning of year		$ (165)
Unsecured senior notes of $40 billion
Accumulated Other Comprehensive Income (Loss) rollforward
Aggregate Principal	$ 40,000

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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