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Overview and Summary of Significant Accounting Policies - Schedule of Reclassifications (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities	$ 1,758	$ 1,421
Net cash provided by (used in) investing activities	(1,583)	(2,554)
Net cash provided by (used in) financing activities	827	2,310
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(42)	(178)
Net change in cash, cash equivalents, and restricted cash	$ 960	999
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities		1,504
Net cash provided by (used in) investing activities		(2,568)
Net cash provided by (used in) financing activities		2,241
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		(178)
Net change in cash, cash equivalents, and restricted cash		999
Adjustments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities		(83)
Net cash provided by (used in) investing activities		14
Net cash provided by (used in) financing activities		69
Effect of exchange rate changes on cash, cash equivalents, and restricted cash		0
Net change in cash, cash equivalents, and restricted cash		$ 0

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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