Contracts with Customers Contracts with Customers (Schedule of Unbilled Receivables and Claims) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Contracts with Customers [Abstract]
Contract with Customer, Receivable, before Allowance for Credit Loss, Current	$ 5,870	$ 5,628
Contract with Customer, Receivable, before Allowance for Credit Loss, Noncurrent	2,841	2,496
Contract with Customer, Asset, Allowance for Credit Loss	(91)	(129)	$ (81)
Total Unbilled Receivables	8,620	7,995
Claims, current	4
Claims, expected to be collected after one year	11	18
Total Claims	$ 15	$ 18

Contracts with Customers [Abstract]

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Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as noncurrent.

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Amount of billed or unbilled claims or other similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts.

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Amount of billed or unbilled claims or similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts that are expected to be collected after the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of billed or unbilled claims or similar items subject to uncertainty concerning their determination or ultimate realization under long-term contracts that are expected to be collected in the next fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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